CVE-2026-54527criticalCWE-79

CVE-2026-54527: critical vulnerability in jupyterlab-git

JupyterLab Git: Stored XSS leading to RCE

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28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.3epss 0.5%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Affected products
jupyterlab · jupyterlab-git
Related CVEs — jupyterlab-git

In the same product, most dangerous first.

CVE-2025-30370HIGHjupyterlab-git has a command injection vulnerability in "Open Git Repository in Terminal"EPSS 0.6%CVE-2026-54528HIGHjupyterlab-git excluded_paths Case-Sensitivity Bypass Allows Reading Excluded DirectoriesEPSS 0.4%