The Editorial Assistant by Sovrn plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'ajax_zemanta_set_featured_image' function in versions up to, and including, 1.3.3. This makes it possible for authenticated attackers, with subscriber-level access and above, to upload attachment files (such as jpg, png, txt, zip), and set the post featured image.
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.