Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/jupyterlab/jupyterlab/commit/4e61e07d0a91145b53fbf96ac74b0387
- https://github.com/jupyterlab/jupyterlab/commit/d5d961f6e10a6442dddbf94d9a976b38
- https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-vmhf-c436-hxj4
- https://www.vulncheck.com/advisories/jupyterlab-before-stored-xss-via-extension-
FAQ
What is CVE-2026-67338?
CVE-2026-67338 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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 PyP...
How severe is CVE-2026-67338?
CVE-2026-67338 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-67338?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.