Critical 9.3Published Jul 8, 2026

CVE-2026-54527JupyterLab Git: Stored XSS leading to RCE

Updated under an hour ago (Oct 26, 2026, 12:20 PM ET)

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It affects jupyterlab-git and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for jupyterlab-git

Exploited in the last 30 days

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: 9.3 CRITICAL (v4.0, CNA)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
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

jupyterlab jupyterlab-git jupyterlab:git (from the name)	from 0.30.0b3, < 0.54.0	CNA record
jupyter jupyterlab-git jupyter:jupyterlab-git	from 0.30.1 before 0.54.0; 0.30.0; 0.30.0	NVD

References

https://github.com/jupyterlab/jupyterlab-git/security/advisories/GHSA-f962-v9hr-pfg5x-refsource-confirm, exploit, mitigation, vendor-advisory
https://github.com/jupyterlab/jupyterlab-git/commit/c6d37b88f36aa59aee317930b95e427fb9d6b09bx-refsource-misc, patch
https://github.com/jupyterlab/jupyterlab-git/releases/tag/v0.54.0x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.