CVE-2026-46725: TYPO3 Extension Content Element Selector

Critical severity, CVSS 9.2. EPSS: 1.9% chance of exploitation in the next 30 days.

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.

Affected products

• TYPO3 Extension Content Element Selector: from 6.0.0, before 6.0.1 (fixed in 6.0.1); from 5.0.0, before 5.0.1 (fixed in 5.0.1); from 4.0.0, before 4.0.2 (fixed in 4.0.2); before 3.0.3 (fixed in 3.0.3)

Published 2026-05-19. Last modified 2026-06-17.