Microsoft.AspNetCore.Authentication.Negotiate
ASP.NET Core authentication handler used to authenticate requests using Negotiate, Kerberos, or NTLM. This package was built from the source code at https://github.com/dotnet/dotnet/tree/5254d8bcf59917edc1e1abc33bdf2442b77b1c70
Activity
- Latest release
- 4d ago
- Total releases
- 253
- Cadence
- ~daily
- Last 12 months
- 49
Details
- License
- MIT
- First release
- Jun 12, 2019
| Version | Released | |
|---|---|---|
9.0.22
patch
|
9.0.22
patch
Dependencies (3)
|
|
8.0.33
patch
|
8.0.33
patch
Dependencies (3)
|
|
11.0.0-rc.3.26522.148
pre
|
11.0.0-rc.3.26522.148
pre
Dependencies (3)
|
|
10.0.14
patch
|
10.0.14
patch
Dependencies (3)
|
|
9.0.21
patch
|
9.0.21
patch
Dependencies (3)
|
|
8.0.32
patch
|
8.0.32
patch
Dependencies (3)
|
|
10.0.13
patch
|
10.0.13
patch
Dependencies (3)
|
|
11.0.0-rc.2.26504.105
pre
|
11.0.0-rc.2.26504.105
pre
Dependencies (3)
|
|
9.0.20
patch
1 CVE
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev |
9.0.20
patch
Dependencies (3)
|
|
10.0.12
patch
1 CVE
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev |
10.0.12
patch
Dependencies (3)
|
|
8.0.31
patch
1 CVE
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev |
8.0.31
patch
Dependencies (3)
|
|
11.0.0-rc.1.26425.128
pre
|
11.0.0-rc.1.26425.128
pre
Dependencies (3)
|
|
9.0.19
patch
1 CVE
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev |
9.0.19
patch
Dependencies (3)
|
|
10.0.11
patch
1 CVE
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev |
10.0.11
patch
Dependencies (3)
|
|
8.0.30
patch
1 CVE
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev |
8.0.30
patch
Dependencies (3)
|
|
11.0.0-preview.7.26381.103
pre
|
11.0.0-preview.7.26381.103
pre
Dependencies (3)
|
|
9.0.18
patch
1 CVE
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev |
9.0.18
patch
Dependencies (3)
|
|
10.0.10
patch
1 CVE
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev |
10.0.10
patch
Dependencies (3)
|
|
8.0.29
patch
1 CVE
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev |
8.0.29
patch
Dependencies (3)
|
|
11.0.0-preview.6.26359.118
pre
|
11.0.0-preview.6.26359.118
pre
Dependencies (3)
|
|
9.0.17
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
9.0.17
patch
Dependencies (3)
|
|
10.0.9
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
10.0.9
patch
Dependencies (3)
|
|
8.0.28
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
8.0.28
patch
Dependencies (3)
|
|
11.0.0-preview.5.26302.115
pre
|
11.0.0-preview.5.26302.115
pre
Dependencies (3)
|
|
9.0.16
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
9.0.16
patch
Dependencies (3)
|
|
10.0.8
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
10.0.8
patch
Dependencies (3)
|
|
8.0.27
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
8.0.27
patch
Dependencies (3)
|
|
11.0.0-preview.4.26230.115
pre
|
11.0.0-preview.4.26230.115
pre
Dependencies (3)
|
|
10.0.7
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
10.0.7
patch
Dependencies (3)
|
|
9.0.15
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
9.0.15
patch
Dependencies (3)
|
|
8.0.26
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
8.0.26
patch
Dependencies (3)
|
|
10.0.6
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
10.0.6
patch
Dependencies (3)
|
|
11.0.0-preview.3.26207.106
pre
|
11.0.0-preview.3.26207.106
pre
Dependencies (3)
|
|
10.0.5
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
10.0.5
patch
Dependencies (3)
|
|
11.0.0-preview.2.26159.112
pre
|
11.0.0-preview.2.26159.112
pre
Dependencies (3)
|
|
9.0.14
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
9.0.14
patch
Dependencies (3)
|
|
8.0.25
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
8.0.25
patch
Dependencies (3)
|
|
10.0.4
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
10.0.4
patch
Dependencies (3)
|
|
11.0.0-preview.1.26104.118
pre
|
11.0.0-preview.1.26104.118
pre
Dependencies (3)
|
|
9.0.13
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
9.0.13
patch
Dependencies (3)
|
|
10.0.3
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
10.0.3
patch
Dependencies (3)
|
|
8.0.24
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
8.0.24
patch
Dependencies (3)
|
|
9.0.12
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
9.0.12
patch
Dependencies (3)
|
|
10.0.2
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
10.0.2
patch
Dependencies (3)
|
|
8.0.23
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
8.0.23
patch
Dependencies (3)
|
|
10.0.1
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
10.0.1
patch
Dependencies (3)
|
|
10.0.0
major
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
10.0.0
major
Dependencies (3)
|
|
9.0.11
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
9.0.11
patch
Dependencies (3)
|
|
8.0.22
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
8.0.22
patch
Dependencies (3)
|
|
9.0.10
patch
3 CVEs
CVE-2026-70179
GHSA-vrrp-6v32-2p8g
Oct 13, 2026
Microsoft Security Advisory CVE-2026-70179 - ASP.NET Core Elevation of Privilege Vulnerability
7.5
/ 10
High
Network
High
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Authentication.Negotiate. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. ASP.NET Core Negotiate LDAP authentication can associate an authenticated identity with an unintended LDAP principal when the LDAP result is not verified against the Kerberos principal SID. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/458 CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects Microsoft .NET projects that use an affected package version listed below. Package name | Affected version | Patched version ------------ | ---------------- | --------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.12 | 10.0.13 Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.31 | 8.0.32 Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.20 | 9.0.21 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgements
RevisionsV1.0 (10/13/2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.10
10.0.11
10.0.12
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
+ 53 more Show less
10.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.29
8.0.3
8.0.30
8.0.31
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
9.0.0
9.0.1
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.18
9.0.19
9.0.2
9.0.20
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
Fixed in
8.0.32
9.0.21
10.0.13
References
Updated Oct 19, 2026 · Source: OSV.dev
CVE-2026-47300
GHSA-8prm-248r-h957
BIT-dotnet-2026-47300
BIT-dotnet-sdk-2026-47300
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47300 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper validation. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Mitigation FactorsYour ASP.NET Core app is only affected if it uses Negotiate authentication and LDAP to retrieve role information. Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8.0Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsArtur Stetsko RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev
CVE-2026-47303
GHSA-2p3q-h3hg-jcqq
BIT-dotnet-2026-47303
BIT-dotnet-sdk-2026-47303
Jul 21, 2026
Microsoft Security Advisory CVE-2026-47303 – .NET Elevation of Privilege Vulnerability
8.8
/ 10
High
Network
Low
Low
None
Unchanged
High
High
High
Executive summaryMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core Negotiate Authentication (Microsoft.AspNetCore.Authentication.Negotiate). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. An elevation of privilege vulnerability exists in the ASP.NET Core Negotiate authentication handler in .NET 8, .NET 9, and .NET 10 due to improper parsing. AnnouncementAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/TBD CVSS Details
Affected Platforms
Affected PackagesThe vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below .NET 10Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 10.0.0, <= 10.0.9 | 10.0.10 .NET 9Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 9.0.0, <= 9.0.17 | 9.0.18 .NET 8Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Authentication.Negotiate | >= 8.0.0, <= 8.0.28 | 8.0.29 Advisory FAQHow do I know if I am affected?If using a package listed in affected packages, you're exposed to the vulnerability. How do I fix the issue?
Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other InformationReporting Security IssuesIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ. Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty. SupportYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. DisclaimerThe information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External LinksAcknowledgementsPham Quang Minh RevisionsV1.0 (July 14, 2026): Advisory published. Affected versions
10.0.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
10.0.6
10.0.7
10.0.8
10.0.9
9.0.0
9.0.1
+ 44 more Show less
9.0.10
9.0.11
9.0.12
9.0.13
9.0.14
9.0.15
9.0.16
9.0.17
9.0.2
9.0.3
9.0.4
9.0.5
9.0.6
9.0.7
9.0.8
9.0.9
8.0.0
8.0.1
8.0.10
8.0.11
8.0.12
8.0.13
8.0.14
8.0.15
8.0.16
8.0.17
8.0.18
8.0.19
8.0.2
8.0.20
8.0.21
8.0.22
8.0.23
8.0.24
8.0.25
8.0.26
8.0.27
8.0.28
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
Fixed in
8.0.29
9.0.18
10.0.10
References
Updated Jul 27, 2026 · Source: OSV.dev |
9.0.10
patch
Dependencies (3)
|