The WPGYM - Wordpress Gym Management System plugin for WordPress is vulnerable to privilege escalation due to a missing capability check on the MJ_gmgt_add_staff_member() function in all versions up to, and including, 67.1.0. This makes it possible for authenticated attackers, with subscriber-level access and above, to create new user accounts with the administrator role.
The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.