An IDOR (Insecure Direct Object Reference) vulnerability exists in oqtane Framework 6.0.0, allowing a logged-in user to access inbox messages of other users by manipulating the notification ID in the request URL. By changing the notification ID, an attacker can view sensitive mail details belonging to other users.
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.