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Description

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.

PUBLISHED Reserved 2026-05-05 | Published 2026-05-21 | Updated 2026-05-22 | Assigner ConcreteCMS




LOW: 2.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-352 Cross-Site request forgery (CSRF)

Product status

Default status
unaffected

5.0 (git)
affected

Credits

Tristan Mandani finder

References

documentation.concretecms.org/...n-history/951-release-notes release-notes

cve.org (CVE-2026-7882)

nvd.nist.gov (CVE-2026-7882)

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