CVE-2026-77138
CriticalCVSS 9.3Summary
The extension fails to safely process untrusted client input from an attacker-controlled cookie directly into PHP's unserialize(). A remote, unauthenticated attacker can supply a crafted serialized payload to trigger PHP Object Injection, leading to Remote Code Execution on the TYPO3 server.
Risk Assessment
An attacker can fully compromise the TYPO3 server, potentially leading to data theft, content modification, or use of the server for further attacks.
Recommendation
Immediately update the TYPO3 extension to a version that includes a fix for this vulnerability and check for signs of compromise.
Original NVD description (English source)
The extension fails to safely process untrusted client input of an attacker-controlled cookie directly to PHP's unserialize(). A remote, unauthenticated attacker can supply a crafted serialized payload to trigger PHP Object Injection, leading to Remote Code Execution on the TYPO3 server.