PT-2026-35934 · Cockpit · Cockpit

Felsec · Published 2026-04-29 · Updated 2026-04-29 · CVE-2026-38991

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Cockpit versions prior to 2.13.6

Description A misconfiguration in the Bucket component isFileTypeAllowed() function allows an authenticated attacker to bypass an extension filter using a specially crafted filename. This enables the renaming of arbitrary files to have a .php extension, which can lead to arbitrary code execution on the underlying server.

Recommendations Update to a version later than 2.13.5. As a temporary workaround, restrict access to the Bucket component or the isFileTypeAllowed() function to minimize the risk of exploitation.

Exploit

Fix

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

CVE-2026-38991

GHSA-J2RX-4JG9-79MW

Affected Products

Cockpit

References · 8

• 🔥 https://felsec.com/posts/cockpit-cms-2.13.5-multi-vulns · Exploit
• https://osv.dev/vulnerability/GHSA-j2rx-4jg9-79mw · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-38991 · Security Note
• https://github.com/Cockpit-HQ/Cockpit · Note
• https://github.com/Cockpit-HQ/Cockpit/releases/tag/2.14.0 · Note
• https://twitter.com/VulmonFeeds/status/2049624062624743636 · Twitter Post
• https://twitter.com/infoflowcloud/status/2049596164014477499 · Twitter Post
• https://twitter.com/CVEnew/status/2049594415891538276 · Twitter Post