CVE-2026-67338
MEDIUMDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 7% of all known CVEs.
References
Related Vulnerabilities
Other CWE-84 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2020-7011 | Medium | 6.1 | 1.0% | - | Fix |
| CVE-2022-40181 | High | 8.3 | 0.9% | - | Fix |
| CVE-2021-3824 | Medium | 6.1 | 0.7% | - | - |
| CVE-2025-58444 | Unscored | - | 0.7% | - | - |
| CVE-2023-25571 | Medium | 6.8 | 0.5% | - | Fix |
| CVE-2026-54443 | Medium | 5.9 | 0.4% | - | - |
Common questions
How do I fix CVE-2026-67338?
Upgrade jupyterlab on debian unstable to 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4 or later.
Is CVE-2026-67338 being actively exploited?
Not that we know of. CVE-2026-67338 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.17% is the estimated probability that it will be exploited in the next 30 days. That is higher than 7% of all scored CVEs.
How severe is CVE-2026-67338?
CVE-2026-67338 has a CVSS v3 base score of 6.1, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-67338 affect?
Published advisories record a fix for jupyterlab (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-03.