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Vulnerability record · CVE-2026-38991 · published 29 April 2026

CVE-2026-38991: Unrestricted file upload vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.54% · top 56.9% CWE-434 · Unrestricted file upload Deferred
8.8CVSS 3.1 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

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

References

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

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-38991), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.