CVE-2026-54527CWE-79

JupyterLab Git: Stored XSS leading to RCE

Critical · published July 8, 2026

CVSS v4.0
9.3
EPSS
1%
Percentile
43.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
9.3 · CRITICAL
Vector
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
EPSS
0.00529 · 43.9th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-07-08T21:03Z
EPSS history
Timeline
  • 08 JUL 21:03Z
    JupyterLab Git: Stored XSS leading to RCE
    cvelistv5