The FileBird – WordPress Media Library Folders & File Manager plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 5.6.3 via folder deletion due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with author access or higher, to delete folders created by other users and make their file uploads visible.
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.