TYPO3 PHP Object Injection via Unserialized Cookie
CVE-2026-46725 Published on May 19, 2026
Remote Code Execution in extension "Content Element Selector" (ceselector)
The extension passes an attacker-controlled cookie directly to PHP's unserialize() without safely processing the input. A remote, unauthenticated attacker can supply a crafted serialized payload to trigger PHP Object Injection, leading to Remote Code Execution on the TYPO3 server. Exploitation requires the content element to be configured with "Persistent Mode: Static" in the plugin settings.
Weakness Type
What is a Marshaling, Unmarshaling Vulnerability?
The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.
CVE-2026-46725 has been classified to as a Marshaling, Unmarshaling vulnerability or weakness.
Affected Versions
TYPO3 Extension "Content Element Selector":- Version 6.0.0 and below 6.0.1 is affected.
- Version 5.0.0 and below 5.0.1 is affected.
- Version 4.0.0 and below 4.0.2 is affected.
- Before 3.0.3 is affected.