What is CVE-2026-38991?

CVE-2026-38991 is a high-severity vulnerability in N/a, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2026-04-29.

How severe is CVE-2026-38991?

High severity. CVSS v3 base score is 8.8 out of 10.

Arbitrary file upload in N/a

CVE-2026-38991

Cockpit 2.13.5 and earlier is affected by a misconfiguration within the Bucket component _isFileTypeAllowed function where a specially crafted filename bypasses an extension filter. This allows an authenticated attacker to rename arbitrary…

Vulnerability class: Unrestricted File Upload

EPSS: 0.000 (10.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

N/a — versions n/a

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

cve@mitre.org
cve@mitre.org

Frequently asked questions

What is CVE-2026-38991?: CVE-2026-38991 is a high-severity vulnerability in N/a, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2026-04-29.
How severe is CVE-2026-38991?: High severity. CVSS v3 base score is 8.8 out of 10.