The Image Photo Gallery Final Tiles Grid WordPress plugin before 3.6.14 does not properly verify authorization on several of its gallery and image management actions, checking ownership against a different object than the one being acted on, or omitting the check entirely, allowing any authenticated user with contributor-level access or above to clone, modify and reorder galleries and images belonging to other users and to write Image Photo Gallery Final Tiles Grid WordPress plugin before 3.6.14 metadata onto arbitrary posts they do not own.