Folders Pro <= 3.0.2 - Authenticated(Author+) Arbitrary File Upload via handle_folders_file_upload

The Folders Pro plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'handle_folders_file_upload' function in all versions up to, and including, 3.0.2. This makes it possible for authenticated attackers, with author access and above, to upload arbitrary files on the affected site's server which may make remote code execution possible.