CVE-2026-54527 | THREATINT

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.

PUBLISHED Reserved 2026-06-15 | Published 2026-07-08 | Updated 2026-07-09 | Assigner GitHub_M

CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

>= 0.30.0b3, < 0.54.0

affected

References

github.com/...ab-git/security/advisories/GHSA-f962-v9hr-pfg5 exploit

github.com/...ab-git/security/advisories/GHSA-f962-v9hr-pfg5

github.com/...ommit/c6d37b88f36aa59aee317930b95e427fb9d6b09b

github.com/jupyterlab/jupyterlab-git/releases/tag/v0.54.0

cve.org (CVE-2026-54527)

nvd.nist.gov (CVE-2026-54527)

Download JSON