Easy Image Collage <= 1.13.5 - Missing Authorization to Authenticated (Contributor+) Data Clearance

The Easy Image Collage plugin for WordPress is vulnerable to unauthorized loss of data due to a missing capability check on the ajax_image_collage() function in all versions up to, and including, 1.13.5. This makes it possible for authenticated attackers, with Contributor-level access and above, to erase all of the content in arbitrary posts.