WP User Frontend Pro <= 4.1.3 - Authenticated (Subscriber+) Arbitrary File Deletion

The WP User Frontend Pro plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the delete_avatar_ajax() function in all versions up to, and including, 4.1.3. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php).