Vulnerability Description
Concrete CMS below 9.5.2 is vulnerable to PHP Object Injection via unserialize() calls in the Workflow, Form block, and File/Set components that lack the allowed_classes restriction. An unauthenticated attacker may trigger arbitrary PHP object instantiation if a malicious serialized payload has been placed in the database. Thanks XananasX7 and Sanjorn Keeratirungsan (dizconnect) for both independently reporting. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 8.4 with vector CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-7888?
CVE-2026-7888 is a documented vulnerability. Concrete CMS below 9.5.2 is vulnerable to PHP Object Injection via unserialize() calls in the Workflow, Form block, and File/Set components that lack the allowed_classes restriction. An unauthenticate...
How severe is CVE-2026-7888?
CVSS scoring is not yet available for CVE-2026-7888. Check NVD for updates.
Is there a patch for CVE-2026-7888?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.