Stored XSS in JupyterLab Extension Manager via Malicious PyPI Package Metadata

Executive Summary

JupyterLab before version 4.5.9 has a stored cross-site scripting (XSS) flaw in its Extension Manager. The issue occurs because it does not properly validate URI protocols in package metadata URLs. Attackers can exploit this by publishing malicious PyPI packages with javascript: URLs in their metadata. When users click the extension name, the JavaScript executes in the JupyterLab origin, allowing arbitrary code execution.

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Detection Guidance

This vulnerability involves malicious JavaScript execution via package metadata URLs in JupyterLab's Extension Manager. Detection requires inspecting installed extensions and their metadata for javascript: URLs in project metadata. Check installed extensions with commands like jupyter labextension list or pip list. Review extension metadata files for suspicious URLs.

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Impact Analysis

This vulnerability allows attackers to run malicious JavaScript in your JupyterLab environment when you interact with a compromised extension. This could lead to unauthorized access to your data, session hijacking, or further exploitation of your system. Users with installed extensions are at risk if they interact with malicious packages.

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Compliance Impact

This vulnerability could lead to data breaches, which may violate GDPR (data protection) and HIPAA (health data privacy) requirements. Organizations using JupyterLab must ensure they update to patched versions to maintain compliance. Failure to address this risk may result in regulatory penalties and loss of trust.

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Mitigation Strategies

Upgrade JupyterLab to version 4.5.9 or later to address the vulnerability. Remove any untrusted or suspicious extensions. Avoid installing extensions from untrusted sources. Monitor PyPI packages for unexpected metadata changes. Review extension permissions and access controls.

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