Media Library Folders <= 8.3.6 - Insecure Direct Object Reference to Authenticated (Author+) Arbitrary Attachment Deletion and Rename

The Media Library Folders plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 8.3.6 via the delete_maxgalleria_media() and maxgalleria_rename_image() functions due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with Author-level access and above, to delete or rename attachments owned by other users (including administrators). The rename flow also deletes all postmeta for the target attachment, causing data loss.