GitHub Advisoryadvisory · Packagist

GHSA-gj26-w59c-29mf Concrete CMS vulnerable to Remote Code Execution by stored PHP object injection

HIGH Published 2026-03-04 Modified 2026-03-04 Official page ↗
Aliases
CVE-2026-3452
Ecosystem
Packagist
Packages
concrete5/concrete5
Severity
High
CVSS vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Weaknesses
CWE-502
Reviewed
2026-03-04

Affected packages

• Packagist concrete5/concrete5: < 9.4.8 → fixed in 9.4.8

Description

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.

Related

Alias · CVE (1)

  • CVE-2026-3452 Concrete CMS below version 9.4.8 is vulnerable to Remote Code Execution by stored PHP object injection into the Express Entry List block… vulnerability

Weakness · CWE (1)

  • CWE-502 Deserialization of Untrusted Data weakness

References