_account_move_file_in_folder.ajax.php in MFScripts YetiShare 3.5.2 directly inserts values from the fileIds parameter into a SQL string. This allows an attacker to inject their own SQL and manipulate the query, typically extracting data from the database, aka SQL Injection.
https://medium.com/%40jra8908/yetishare-3-5-2-4-5-3-multiple-vulnerabilities-2d01d0cd7459