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  5. GHSA-vmhf-c436-hxj4

GHSA-vmhf-c436-hxj4: JupyterLab: Stored XSS in extension manager through package metadata unsanitized URI protocol

June 19, 2026

A malicious PyPI package can place a javascript: URL in its [project.urls] metadata. JupyterLab’s Extension Manager renders this as the extension’s home-page link without validating the protocol, so a user who clicks the extension name executes attacker-controlled JavaScript in the JupyterLab origin.

References

  • github.com/advisories/GHSA-vmhf-c436-hxj4
  • github.com/jupyterlab/jupyterlab/commit/4e61e07d0a91145b53fbf96ac74b0387f6bc51f6
  • github.com/jupyterlab/jupyterlab/commit/d5d961f6e10a6442dddbf94d9a976b3897055a12
  • github.com/jupyterlab/jupyterlab/releases/tag/v4.5.9
  • github.com/jupyterlab/jupyterlab/security/advisories/GHSA-vmhf-c436-hxj4

Code Behaviors & Features

Detect and mitigate GHSA-vmhf-c436-hxj4 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →

Affected versions

All versions before 4.5.9

Fixed versions

  • 4.5.9

Solution

Upgrade to version 4.5.9 or above.

Impact 5.4 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Learn more about CVSS

Weakness

  • CWE-84: Improper Neutralization of Encoded URI Schemes in a Web Page

Source file

pypi/jupyterlab/GHSA-vmhf-c436-hxj4.yml

Spotted a mistake? Edit the file on GitLab.

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