The School Management System – WPSchoolPress plugin for WordPress is vulnerable to arbitrary user deletion due to a missing capability check on the wpsp_DeleteUser() function in all versions up to, and including, 2.2.16. This makes it possible for authenticated attackers, with teacher-level access and above, to delete arbitrary user accounts.
https://plugins.trac.wordpress.org/browser/wpschoolpress/tags/2.2.16/lib/wpsp-ajaxworks.php#L22