CVE-2026-54527
Critical
Description
JupyterLab Git is a Git extension for JupyterLab. From 0.30.0b3 before 0.54.0, the PlainTextDiff.ts createHeader() method passes Git filenames directly to innerHTML when rendering renamed files in commit history, allowing a crafted filename to execute JavaScript when a victim views the rename diff in the Git History tab. This issue is fixed in version 0.54.0.
SeverityCritical
CVSS9.0
Exploit probability45. percentile0.5%
ProductJupyterlab-git
PublishedJul 8, 2026
First seenJul 8, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- jupyter jupyterlab-git0.54.0 or later
- jupyterlab-git0.54.0 or later
- jupyterlab-git-core0.54.0 or later
- @jupyterlab/git0.54.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| jupyter jupyterlab-git | 0.30.1 ≤ v < 0.54.0, 0.30.0 | 0.54.0 |
| jupyterlab-gitPyPI | 0.30.0b3 ≤ v < 0.54.0 | 0.54.0 |
| jupyterlab-git-corePyPI | 0.30.0b3 ≤ v < 0.54.0 | 0.54.0 |
| @jupyterlab/gitnpm | 0.30.0-beta.3 ≤ v < 0.54.0 | 0.54.0 |
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