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CVE-2026-54527

Jupyter Jupyterlab-git cross-site scripting (XSS)

9.0 CRITICALPublic exploitEPSS 0.53%
  1. Published8 Jul 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Affected products

Jupyter Jupyterlab-git≥ 0.30.1 < 0.54.0 · 0.30.0

Remediation

Fixed in
Jupyter Jupyterlab-git≥ 0.54.0

References

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Frequently asked

Is CVE-2026-54527 being actively exploited?

CVE-2026-54527 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.53%.

How severe is CVE-2026-54527?

CVE-2026-54527 has a CVSS 3.1 base score of 9.0, rated critical. EPSS estimates a 0.53% probability of exploitation.

Which products are affected by CVE-2026-54527?

Affected products include Jupyter Jupyterlab-git.

How do I fix CVE-2026-54527?

Upgrade affected software to a fixed version, for example Jupyter Jupyterlab-git 0.54.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-54527 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.