CVE-2026-77138: TYPO3-EXT-SA-2026-014: Remote Code Execution in extension "HTML5 Video Player vs. Powermail" (html5videoplayer_powermail)

Severity: Critical

CVSS Score: 9.3

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.