The Sreamit theme for WordPress is vulnerable to arbitrary file downloads in all versions up to, and including, 4.0.1. This is due to insufficient file validation in the 'st_send_download_file' function. This makes it possible for authenticated attackers, with subscriber-level access and above, to download arbitrary files.
https://themeforest.net/item/streamit-video-streaming-wordpress-theme/29772881
https://documentation.iqonic.design/streamit/change-log/streamit-v4-0/