Broken Access Control in Backend Module in sf_event_mgt

sf_event_mgt is an event management and registration extension for the TYPO3 CMS based on ExtBase and Fluid. In affected versions the existing access control check for events in the backend module got broken during the update of the extension to TYPO3 12.4, because the `RedirectResponse` from the `$this->redirect()` function was never handled. This issue has been addressed in version 7.4.0. Users are advised to upgrade. There are no known workarounds for this vulnerability.

The sf_event_mgt (aka Event management and registration) extension before 4.3.1 and 5.x before 5.1.1 for TYPO3 allows Information Disclosure (participant data, and event data via email) because of Broken Access Control.