CVE-2026-3452

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 gave this vulnerability a CVSS v.4.0 score of 8.9 with 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. Thanks YJK ( @YJK0805 https://hackerone.com/yjk0805 ) of ZUSO ART https://zuso.ai/ for reporting.

PUBLISHED Reserved 2026-03-02 | Published 2026-03-04 | Updated 2026-03-04 | Assigner ConcreteCMS

Problem types

CWE-502 Deserialization of Untrusted Data

Product status

Credits

YJK (@YJK0805) of ZUSO ART reporter

References

github.com/...es/167f16e4805d8ab546d2997c753ac21bf4854920://

documentation.concretecms.org/...n-history/948-release-notes

cve.org (CVE-2026-3452)

nvd.nist.gov (CVE-2026-3452)

Download JSON