GitHub Advisoryadvisory · Packagist

GHSA-xjg6-5v39-v7fc Concrete CMS is vulnerable to CSRF via Backend\File::approveVersion

LOW Published 2026-05-26 Modified 2026-06-29 Official page ↗
Aliases
CVE-2026-8340
Ecosystem
Packagist
Packages
concrete5/concrete5
Severity
Low
CVSS 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
Weaknesses
CWE-352
Reviewed
2026-06-29

Affected packages

• Packagist concrete5/concrete5: < 9.5.1 → fixed in 9.5.1

Description

Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backend\File::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an attacker-chosen previously-uploaded version (downgrade to an older version of a file, or activation of a co-editor's unpublished version). Thanks Winston Crooker for reporting.

Related

Alias · CVE (1)

  • CVE-2026-8340 Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backend\File::approveVersion. vulnerability

Weakness · CWE (1)

  • CWE-352 Cross-Site Request Forgery weakness

References