The Download Manager plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the makeMediaPublic() and makeMediaPrivate() functions in all versions up to, and including, 3.3.51. This is due to the functions only checking for editposts capability without verifying post ownership via currentusercan('editpost', $id), and the destructive operations executing before the admin-level check in mediaAccessControl(). This makes it possible for authenticated attackers, with Contributor-level access and above, to strip all protection metadata (password, access restrictions, private flag) from any media file they do not own, making admin-protected files publicly accessible via their direct URL.

The Download Manager WordPress plugin before 3.3.07 doesn't prevent directory listing on web servers that don't use htaccess, allowing unauthorized access of files.

The Download Manager plugin for WordPress is vulnerable to unauthorized download of password-protected content due to improper password validation on the checkFilePassword function in all versions up to, and including, 3.3.03. This makes it possible for unauthenticated attackers to download password-protected files.