HIGH
GHSA-gj26-w59c-29mf
Concrete CMS vulnerable to Remote Code Execution by stored PHP object injection
Quick fix
GHSA-gj26-w59c-29mf — concrete5/concrete5: upgrade to the fixed version with the command below.
composer require concrete5/concrete5:^9.4.8Details
Concrete CMS below version 9.4.8 is vulnerable to Remote Code Execution by stored PHP object injection into the Express Entry List block via the columns parameter. An authenticated administrator can store attacker-controlled serialized data in block configuration fields that are later passed to unserialize() without class restrictions or integrity checks.
The Concrete CMS security team thanks YJK ( @YJK0805 https://hackerone.com/yjk0805 ) of ZUSO ART https://zuso.ai/ for reporting.
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Affected packages
Packagist/concrete5/concrete5
Introduced in:
0Fixed in: 9.4.8Fix
composer require concrete5/concrete5:^9.4.8References
- https://nvd.nist.gov/vuln/detail/CVE-2026-3452[ADVISORY]
- https://github.com/concretecms/concretecms/pull/12826/changes/167f16e4805d8ab546d2997c753ac21bf4854920[WEB]
- https://documentation.concretecms.org/9-x/developers/introduction/version-history/948-release-notes[WEB]
- https://github.com/concretecms/concretecms[PACKAGE]