CVE-2026-7882: Concretecms Concrete CMS

Medium severity, CVSS 4.3. EPSS: 0.2% chance of exploitation in the next 30 days.

Concrete CMS 9.5.0 and below is vulnerable to unauthorized file deletion due to an Inverted CSRF token check in the DeleteFile controller. The code throws an error when the token IS valid and proceeds with file deletion when the token is invalid or missing. This effectively disables CSRF protection for the file deletion endpoint, allowing cross-site request forgery attacks against users who have permission to edit conversation messages. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.3 with a vector of CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Tristan Mandani for reporting.

Affected products

• Concretecms Concrete CMS: before 9.5.1 (fixed in 9.5.1)

Published 2026-05-21. Last modified 2026-07-23.