Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Concretecms | Concrete Cms | < 9.4.8 |
Related Weaknesses (CWE)
References
- https://documentation.concretecms.org/9-x/developers/introduction/version-historRelease NotesPatchVendor Advisory
- https://github.com/concretecms/concretecms/pull/12826/changes/167f16e4805d8ab546Broken Link
FAQ
What is CVE-2026-3452?
CVE-2026-3452 is a vulnerability with a CVSS score of 7.2 (HIGH). 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 s...
How severe is CVE-2026-3452?
CVE-2026-3452 has been rated HIGH with a CVSS base score of 7.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-3452?
Check the references section above for vendor advisories and patch information. Affected products include: Concretecms Concrete Cms.