JupyterLab before 4.5.9 Stored XSS via Extension Manager
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.
CVE-2026-67338
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-67338
jupyterlab
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "jupyterlab",
"product": "jupyterlab",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "4.5.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "4.5.9",
"versionType": "semver"
}
],
"packageURL": "pkg:pypi/jupyterlab",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-67338
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #12812 · Revision 1
- Added to Heist Feed
- Publisher date