CVE-2026-38991

CVSS 8.8 HIGHEPSS 0.4%CWE-434

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.8EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

29 Apr 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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 files with the .php file extension enabling arbitrary code to be executed on the underlying server.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

n/a · n/a

References

https://felsec.com/posts/cockpit-cms-2.13.5-multi-vulns/https://github.com/Cockpit-HQ/Cockpit/releases/tag/2.14.0