YayExtra – WooCommerce Extra Product Options <= 1.3.7 - Unauthenticated Arbitrary File Upload via handle_upload_file Function

The YayExtra – WooCommerce Extra Product Options plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the handle_upload_file function in all versions up to, and including, 1.3.7. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.