9.3

CVE-2026-54527: jupyter jupyterlab-git Cross-site Scripting

CVSS: 9.3v4.0CriticalAnalyzed
AliasesGHSA-f962-v9hr-pfg5PYSEC-2026-2540PYSEC-2026-2541
Published 08-07-2026Last modified 09-07-2026
Open JSON

Vulnerability summary

CVE-2026-54527 is a critical (CVSS 9.3) Cross-site Scripting vulnerability in jupyter jupyterlab-git. EPSS estimates a 0.53% chance of exploitation in the next 30 days, higher than 43.5% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.3/10
010
Critical · v4.0 (CVE.org)
EPSS score
0.53%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Timeline

  1. 08-07-2026
    PublishedVulnerability first disclosed.
  2. 09-07-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 4 sources · 2 versions

EPSS trend

Probability

0.53%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

0.00 pp

From 0.53% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.53%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Jupyterlab Git

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

PyPI2 products
  • jupyterlab-git≥ 0.30.0b3, < 0.54.0
  • jupyterlab-git-core≥ 0.30.0b3, < 0.54.0
@jupyterlab1 product
  • git≥ 0.30.0-beta.3, < 0.54.0
Jupyter1 product
Jupyterlab1 product

4 vendors · 5 products

References

10 links