CVE WatchOct 8, 2026

CVE-2026-67338

JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols i

CVSS

6.1

Medium

EPSS

0.3%

p22

KEV

—

Exploit Today

0-100

Published: Aug 1, 2026 · Last modified: Oct 8, 2026 · CWE-84

EPSS · 30d

0.2%EPSS · 30 days0.3%

2026-09-212026-10-19

Technical 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.

Official references

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