Sh4D0Byss

**Name of the Vulnerable Software and Affected Versions** Concrete CMS versions prior to 9.5.2 **Description** PHP Object Injection occurs due to the use of `unserialize()` calls within the Workflow, Form block, and File/Set components that do not implement the `allowed classes` restriction. This allows an unauthenticated attacker to trigger arbitrary PHP object instantiation if a malicious serialized payload is present in the database. **Recommendations** Update to version 9.5.2 or later.