high8.9
CVE-2026-3452
Concrete CMS vulnerable to Remote Code Execution by stored PHP object injection
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | concrete5/concrete5 | < 9.4.8 | 9.4.8 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Concretecms | Concrete Cms | before 9.4.8 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://documentation.concretecms.org/9-x/developers/introduction/version-history/948-release-notes
- https://github.com/concretecms/concretecms/pull/12826/changes/167f16e4805d8ab546d2997c753ac21bf4854920://
- https://github.com/advisories/GHSA-gj26-w59c-29mf
- https://nvd.nist.gov/vuln/detail/CVE-2026-3452
- https://github.com/concretecms/concretecms/pull/12826/changes/167f16e4805d8ab546d2997c753ac21bf4854920