CVE-2026-10721: Concrete CMS

High severity, CVSS 8.4. EPSS: 0.1% chance of exploitation in the next 30 days.

Concrete CMS below 9.5.2 is vulnerable to PHP Object Injection via unserialize() calls in the  in Permission, Cache, and Search components. An unauthenticated attacker may trigger arbitrary PHP object instantiation if a malicious serialized payload has been placed in the database. Thanks XananasX7 for reporting.

Affected products

• Concrete CMS Concrete CMS

Published 2026-06-10. Last modified 2026-07-23.