BM Content Builder < 3.17.1 - Authenticated (Subscriber+) Arbitrary File Deletion

The BM Content Builder plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the ux_cb_remove_layout_ajax() and ux_cb_tools_export_ajax() functions in all versions up to, and excluding, 3.17.1. 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).