jupyterlab-git-core
A Git extension for JupyterLab
View on Github
Activity
- Latest release
- 1mo ago
- Total releases
- 6
- Cadence
- ~18 days
- Last 12 months
- 6
Reach
- Stars
- 1.6k
Details
- License
- custom
- First release
- Apr 27, 2026
| Version | Released | |
|---|---|---|
0.54.1
patch
| ||
0.54.0
minor
| ||
0.54.0a1
pre
1 CVE
CVE-2026-54527
PYSEC-2026-2541
GHSA-f962-v9hr-pfg5
PYSEC-2026-2540
Jul 13, 2026
jupyterlab-git extension: Stored XSS leading to RCE
Critical
Network
Low
Low
Overview Amazon Web Services (AWS) Security has identified a stored cross-site scripting (XSS) issue in the jupyterlab-git JupyterLab extension that can lead to remote code execution (RCE). The issue exists in the PlainTextDiff.ts component, where the createHeader() method passes Git filenames directly to innerHTML without sanitization when rendering diffs for renamed files in commit history. This allows an adversary to craft a filename containing arbitrary HTML/JavaScript that executes when another user views the rename diff in the Git History tab. The issue can be leveraged through the rename history view in the JupyterLab Git panel. An adversary creates a file with a crafted filename containing a JavaScript payload (e.g., <img src=x onerror=eval(atob("base64_payload"))>.py), renames the file in a subsequent commit, and pushes to a shared repository. When a victim clones the repository, navigates to the Git History tab, clicks the rename commit, and then clicks the renamed file to view the diff, the unsanitized filename renders via innerHTML, executing arbitrary JavaScript in the victim's browser session. The injected JavaScript reads the xsrf cookie, opens a JupyterLab terminal via POST /api/terminals, connects via WebSocket, and executes arbitrary shell commands — achieving full RCE. An adversary can leverage this to exfiltrate secrets or credentials from the victim's environment. Scope of impact We discovered this issue during internal security testing. The issue is present in the default configuration of JupyterLab when the jupyterlab-git extension is installed. The attack requires:
The issue could allow an actor who has access to a shared Git repository to execute arbitrary JavaScript in another user's JupyterLab environment by committing a file with a crafted filename, potentially leading to remote code execution with access to user code, data, environment variables, and credentials. Proof of concept The issue exists in the createHeader() method where filenames from rename history are passed directly to innerHTML without sanitization: [1] https://github.com/jupyterlab/jupyterlab-git/blob/main/src/components/diff/PlainTextDiff.ts#L214 Attack flow:
Proof-of-concept mitigation The issue can be mitigated by replacing innerHTML with textContent for filename rendering in the createHeader() method of PlainTextDiff.ts. Alternatively, proper HTML sanitization (escaping <, >, &, ", ') can be applied before inserting user-controlled filenames into the DOM. Affected versions
0.53.0
0.53.0a1
0.54.0a0
0.54.0a1
Fixed in
0.54.0
References Updated Jul 13, 2026 · Source: OSV.dev | ||
0.54.0a0
pre
1 CVE
CVE-2026-54527
PYSEC-2026-2541
GHSA-f962-v9hr-pfg5
PYSEC-2026-2540
Jul 13, 2026
jupyterlab-git extension: Stored XSS leading to RCE
Critical
Network
Low
Low
Overview Amazon Web Services (AWS) Security has identified a stored cross-site scripting (XSS) issue in the jupyterlab-git JupyterLab extension that can lead to remote code execution (RCE). The issue exists in the PlainTextDiff.ts component, where the createHeader() method passes Git filenames directly to innerHTML without sanitization when rendering diffs for renamed files in commit history. This allows an adversary to craft a filename containing arbitrary HTML/JavaScript that executes when another user views the rename diff in the Git History tab. The issue can be leveraged through the rename history view in the JupyterLab Git panel. An adversary creates a file with a crafted filename containing a JavaScript payload (e.g., <img src=x onerror=eval(atob("base64_payload"))>.py), renames the file in a subsequent commit, and pushes to a shared repository. When a victim clones the repository, navigates to the Git History tab, clicks the rename commit, and then clicks the renamed file to view the diff, the unsanitized filename renders via innerHTML, executing arbitrary JavaScript in the victim's browser session. The injected JavaScript reads the xsrf cookie, opens a JupyterLab terminal via POST /api/terminals, connects via WebSocket, and executes arbitrary shell commands — achieving full RCE. An adversary can leverage this to exfiltrate secrets or credentials from the victim's environment. Scope of impact We discovered this issue during internal security testing. The issue is present in the default configuration of JupyterLab when the jupyterlab-git extension is installed. The attack requires:
The issue could allow an actor who has access to a shared Git repository to execute arbitrary JavaScript in another user's JupyterLab environment by committing a file with a crafted filename, potentially leading to remote code execution with access to user code, data, environment variables, and credentials. Proof of concept The issue exists in the createHeader() method where filenames from rename history are passed directly to innerHTML without sanitization: [1] https://github.com/jupyterlab/jupyterlab-git/blob/main/src/components/diff/PlainTextDiff.ts#L214 Attack flow:
Proof-of-concept mitigation The issue can be mitigated by replacing innerHTML with textContent for filename rendering in the createHeader() method of PlainTextDiff.ts. Alternatively, proper HTML sanitization (escaping <, >, &, ", ') can be applied before inserting user-controlled filenames into the DOM. Affected versions
0.53.0
0.53.0a1
0.54.0a0
0.54.0a1
Fixed in
0.54.0
References Updated Jul 13, 2026 · Source: OSV.dev | ||
0.53.0
initial
1 CVE
CVE-2026-54527
PYSEC-2026-2541
GHSA-f962-v9hr-pfg5
PYSEC-2026-2540
Jul 13, 2026
jupyterlab-git extension: Stored XSS leading to RCE
Critical
Network
Low
Low
Overview Amazon Web Services (AWS) Security has identified a stored cross-site scripting (XSS) issue in the jupyterlab-git JupyterLab extension that can lead to remote code execution (RCE). The issue exists in the PlainTextDiff.ts component, where the createHeader() method passes Git filenames directly to innerHTML without sanitization when rendering diffs for renamed files in commit history. This allows an adversary to craft a filename containing arbitrary HTML/JavaScript that executes when another user views the rename diff in the Git History tab. The issue can be leveraged through the rename history view in the JupyterLab Git panel. An adversary creates a file with a crafted filename containing a JavaScript payload (e.g., <img src=x onerror=eval(atob("base64_payload"))>.py), renames the file in a subsequent commit, and pushes to a shared repository. When a victim clones the repository, navigates to the Git History tab, clicks the rename commit, and then clicks the renamed file to view the diff, the unsanitized filename renders via innerHTML, executing arbitrary JavaScript in the victim's browser session. The injected JavaScript reads the xsrf cookie, opens a JupyterLab terminal via POST /api/terminals, connects via WebSocket, and executes arbitrary shell commands — achieving full RCE. An adversary can leverage this to exfiltrate secrets or credentials from the victim's environment. Scope of impact We discovered this issue during internal security testing. The issue is present in the default configuration of JupyterLab when the jupyterlab-git extension is installed. The attack requires:
The issue could allow an actor who has access to a shared Git repository to execute arbitrary JavaScript in another user's JupyterLab environment by committing a file with a crafted filename, potentially leading to remote code execution with access to user code, data, environment variables, and credentials. Proof of concept The issue exists in the createHeader() method where filenames from rename history are passed directly to innerHTML without sanitization: [1] https://github.com/jupyterlab/jupyterlab-git/blob/main/src/components/diff/PlainTextDiff.ts#L214 Attack flow:
Proof-of-concept mitigation The issue can be mitigated by replacing innerHTML with textContent for filename rendering in the createHeader() method of PlainTextDiff.ts. Alternatively, proper HTML sanitization (escaping <, >, &, ", ') can be applied before inserting user-controlled filenames into the DOM. Affected versions
0.53.0
0.53.0a1
0.54.0a0
0.54.0a1
Fixed in
0.54.0
References Updated Jul 13, 2026 · Source: OSV.dev | ||
0.53.0a1
pre
1 CVE
CVE-2026-54527
PYSEC-2026-2541
GHSA-f962-v9hr-pfg5
PYSEC-2026-2540
Jul 13, 2026
jupyterlab-git extension: Stored XSS leading to RCE
Critical
Network
Low
Low
Overview Amazon Web Services (AWS) Security has identified a stored cross-site scripting (XSS) issue in the jupyterlab-git JupyterLab extension that can lead to remote code execution (RCE). The issue exists in the PlainTextDiff.ts component, where the createHeader() method passes Git filenames directly to innerHTML without sanitization when rendering diffs for renamed files in commit history. This allows an adversary to craft a filename containing arbitrary HTML/JavaScript that executes when another user views the rename diff in the Git History tab. The issue can be leveraged through the rename history view in the JupyterLab Git panel. An adversary creates a file with a crafted filename containing a JavaScript payload (e.g., <img src=x onerror=eval(atob("base64_payload"))>.py), renames the file in a subsequent commit, and pushes to a shared repository. When a victim clones the repository, navigates to the Git History tab, clicks the rename commit, and then clicks the renamed file to view the diff, the unsanitized filename renders via innerHTML, executing arbitrary JavaScript in the victim's browser session. The injected JavaScript reads the xsrf cookie, opens a JupyterLab terminal via POST /api/terminals, connects via WebSocket, and executes arbitrary shell commands — achieving full RCE. An adversary can leverage this to exfiltrate secrets or credentials from the victim's environment. Scope of impact We discovered this issue during internal security testing. The issue is present in the default configuration of JupyterLab when the jupyterlab-git extension is installed. The attack requires:
The issue could allow an actor who has access to a shared Git repository to execute arbitrary JavaScript in another user's JupyterLab environment by committing a file with a crafted filename, potentially leading to remote code execution with access to user code, data, environment variables, and credentials. Proof of concept The issue exists in the createHeader() method where filenames from rename history are passed directly to innerHTML without sanitization: [1] https://github.com/jupyterlab/jupyterlab-git/blob/main/src/components/diff/PlainTextDiff.ts#L214 Attack flow:
Proof-of-concept mitigation The issue can be mitigated by replacing innerHTML with textContent for filename rendering in the createHeader() method of PlainTextDiff.ts. Alternatively, proper HTML sanitization (escaping <, >, &, ", ') can be applied before inserting user-controlled filenames into the DOM. Affected versions
0.53.0
0.53.0a1
0.54.0a0
0.54.0a1
Fixed in
0.54.0
References Updated Jul 13, 2026 · Source: OSV.dev |