The Interactive Contact Form and Multi Step Form Builder with Drag & Drop Editor – Funnelforms Free plugin for WordPress is vulnerable to unauthorized loss of data due to a missing capability check on the af2_handel_file_remove AJAX action in all versions up to, and including, 3.7.3.2. This makes it possible for unauthenticated attackers to delete arbitrary media files.
https://plugins.trac.wordpress.org/changeset/3141470/funnelforms-free/trunk/frontend/frontend.php