CVE-2026-54527 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-54527CRITICAL

JupyterLab Git: Stored XSS leading to RCE

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   L   A   H   H   H    9.3   .0036   29.3     —

AFFECTED
  Product         Versions                 Fixed
  jupyterlab-git  >= 0.30.0b3, < 0.54.0 –  —

TIMELINE
  Jun 15  Reserved by GitHub_M
  Jul 8   EXPLOIT PUBLISHED — CVE-2026-54527 (jupyterlab-git). Public exploit reference added.
  Jul 8   Published (CNA: GitHub_M)

CWE-79 · CNA: GitHub_M · CVSS v4.0 · 3 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 15, 2026	Reserved	Reserved by GitHub_M
July 8, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-54527 (jupyterlab-git). Public exploit reference added.
July 8, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
jupyterlab	jupyterlab-git	—	>= 0.30.0b3, < 0.54.0	—

Weaknesses

CWE-79

References (3)

https://github.com/jupyterlab/jupyterlab-git/commit/c6d37b88f36aa59aee317930b95e427fb9d6b09b [Patch]
https://github.com/jupyterlab/jupyterlab-git/releases/tag/v0.54.0 [Release Notes]
https://github.com/jupyterlab/jupyterlab-git/security/advisories/GHSA-f962-v9hr-pfg5 [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-54527 at cve.org

Vendors: jupyterlab

Weaknesses: CWE-79

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-54527 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.