CVE-2026-54527
JupyterLab Git: Stored XSS leading to RCE
CRITICAL 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.
- Affected
- jupyterlab · jupyterlab-git
- CVSS v4.0 GITHUB
- 9.3 CRITICAL
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS v4.0 GitHub
- 8.6 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - CVSS v3.1 NVD
- 9.0 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H - EPSS
- 0.53% chance of exploitation in the next 30 days, 44th percentile
- Published
- 2026-07-08
- Updated
- 2026-07-09
Proof-of-concept exploits (2)
- advisories/GHSA-f962-v9hr-pfg5
- jiy2020/Stored-XSS-leading-to-Remote-Code-Execution-Vulnerability-in-gpu-jupyter-0★ · 2026-06-30
Security advisories
- jupyterlab/jupyterlab-git/security/advisories/GHSA-f962-v9hr-pfg5
- jupyterlab/jupyterlab-git/commit/c6d37b88f36aa59aee317930b95e427fb9d6b09b