{"id":"CVE-2026-67338","title":"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","summary":"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 p…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cwe":["CWE-84"],"published":"2026-08-01","updated":"2026-09-09","sourceUpdated":"2026-09-09T20:36:38.867","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67338","references":[{"url":"https://github.com/jupyterlab/jupyterlab/commit/4e61e07d0a91145b53fbf96ac74b0387f6bc51f6","label":"disclosure@vulncheck.com"},{"url":"https://github.com/jupyterlab/jupyterlab/commit/d5d961f6e10a6442dddbf94d9a976b3897055a12","label":"disclosure@vulncheck.com"},{"url":"https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-vmhf-c436-hxj4","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/jupyterlab-before-stored-xss-via-extension-manager","label":"disclosure@vulncheck.com"},{"url":"https://github.com/jupyterlab/jupyterlab"},{"url":"https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.9"}],"tags":["nvd","osv","pip"],"epss":0.00172,"epssPercentile":0.06953,"ingestedAt":"2026-08-02T09:18:11.534Z","aliases":["GHSA-vmhf-c436-hxj4"],"ecosystem":"pip","vendor":"jupyterlab","product":"jupyterlab","affected":["jupyterlab < 4.5.9"],"patched":["jupyterlab 4.5.9"],"slug":"CVE-2026-67338","body":"## Overview\n\nJupyterLab 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-67338)\n\nAffected packages:\n\n- `jupyterlab < 4.5.9`\n\nPatched in:\n\n- `jupyterlab 4.5.9`\n\nSource: https://osv.dev/vulnerability/GHSA-vmhf-c436-hxj4","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}