CVE-2026-3452
Received Received - Intake
Remote Code Execution via PHP Object Injection in Concrete CMS

Publication date: 2026-03-04

Last updated on: 2026-03-04

Assigner: ConcreteCMS

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.
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Meta Information
Published
2026-03-04
Last Modified
2026-03-04
Generated
2026-06-16
AI Q&A
2026-03-04
EPSS Evaluated
2026-06-14
NVD
CVE-2026-3452
EUVD
EUVD-2026-9356
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
concretecms concrete_cms to 9.4.8 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-502 The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
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Executive Summary

Concrete CMS versions below 9.4.8 have a vulnerability that allows Remote Code Execution through stored PHP object injection. This occurs in the Express Entry List block via the columns parameter. An authenticated administrator can inject attacker-controlled serialized data into block configuration fields. These fields are later passed to the PHP unserialize() function without any class restrictions or integrity checks, enabling the execution of malicious code.

Impact Analysis

This vulnerability can lead to Remote Code Execution on the affected system, which means an attacker with administrator access can execute arbitrary code. This can compromise the entire system, potentially allowing the attacker to take full control, access sensitive data, modify or delete information, and disrupt services.

Compliance Impact

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