The femanager extension for TYPO3 allows Insecure Direct Object Reference resulting in unauthorized modification of userdata. This issue affects femanager version 6.4.1 and below, 7.0.0 to 7.5.2 and 8.0.0 to 8.3.0
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.