Rémy Daniel

**Name of the Vulnerable Software and Affected Versions** TYPO3 versions prior to 8.7.55 TYPO3 versions prior to 9.5.44 TYPO3 versions prior to 10.4.41 TYPO3 versions prior to 11.5.33 TYPO3 versions prior to 12.4.8 **Description** The issue affects TYPO3 installations with at least two different sites, allowing a session cookie generated for one site to be reused on another without requiring additional authentication. This primarily affects the frontend of the website and requires a valid user account to exploit. **Recommendations** For versions prior to 8.7.55, update to version 8.7.55 or later. For versions prior to 9.5.44, update to version 9.5.44 or later. For versions prior to 10.4.41, update to version 10.4.41 or later. For versions prior to 11.5.33, update to version 11.5.33 or later. For versions prior to 12.4.8, update to version 12.4.8 or later.