CVE-2026-67338

Name	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
jupyterlab (PTS)	trixie	4.0.11+ds1+~cs11.25.27-7	vulnerable
	forky, sid	4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-3	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
jupyterlab	source	(unstable)	(unfixed)

Notes

https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-vmhf-c436-hxj4
https://github.com/jupyterlab/jupyterlab/commit/4e61e07d0a91145b53fbf96ac74b0387f6bc51f6 (v4.6.0rc0)
https://github.com/jupyterlab/jupyterlab/commit/d5d961f6e10a6442dddbf94d9a976b3897055a12 (v4.6.0rc1)