Auto Featured Image (Auto Post Thumbnail) <= 4.1.7 - Authenticated (Author+) Server-Side Request Forgery

The Auto Featured Image (Auto Post Thumbnail) plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 4.1.7 via the upload_to_library AJAX action. This makes it possible for authenticated attackers, with author-level access and above, to make web requests to arbitrary locations originating from the web application and can be used to query and modify information from internal services.