PT-2026-42772 · Concrete Cms · Concrete Cms

Winston Crooker

·

Published

2026-05-22

·

Updated

2026-05-22

·

CVE-2026-8340

CVSS v4.0

2.3

Low

VectorAV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Concrete CMS 9.5.0 and below is vulnerable to CSRF via BackendFile::approveVersion. Victim with edit file contents permission is CSRF'd into publishing an attacker-chosen previously-uploaded version (downgrade to an older version of a file, or activation of a co-editor's unpublished version). The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.3 with vector 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 Winston Crooker for reporting.

Fix

CSRF

Weakness Enumeration

CWE-352

Related Identifiers

CVE-2026-8340

Affected Products

Concrete Cms