Medium severity6.1NVD Advisory· Published Aug 1, 2026· Updated Sep 9, 2026
CVE-2026-67338
CVE-2026-67338
Description
JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in project metadata that execute arbitrary JavaScript in the JupyterLab origin when users click the extension name.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1- Range: <4.5.9
Patches
Vulnerability mechanics
References
4- github.com/jupyterlab/jupyterlab/commit/4e61e07d0a91145b53fbf96ac74b0387f6bc51f6nvd
- github.com/jupyterlab/jupyterlab/commit/d5d961f6e10a6442dddbf94d9a976b3897055a12nvd
- github.com/jupyterlab/jupyterlab/security/advisories/GHSA-vmhf-c436-hxj4nvd
- www.vulncheck.com/advisories/jupyterlab-before-stored-xss-via-extension-managernvd
News mentions
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