What is CVE-2026-67338?

CVE-2026-67338 is a medium-severity vulnerability in Jupyterlab, classified under CWE-84. CVSS score: 6.1/10. Published 2026-08-01.

How severe is CVE-2026-67338?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Vulnerability in Jupyterlab

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 in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in pro…

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Jupyterlab — versions 0, 4.5.9

Weakness classification (CWE)

CWE-84

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-67338?: CVE-2026-67338 is a medium-severity vulnerability in Jupyterlab, classified under CWE-84. CVSS score: 6.1/10. Published 2026-08-01.
How severe is CVE-2026-67338?: Medium severity. CVSS v3 base score is 6.1 out of 10.