Mentoring <= 1.2.8 - Unauthenticated Privilege Escalation in mentoring_process_registration

The Mentoring plugin for WordPress is vulnerable to privilege escalation in all versions up to, and including, 1.2.8. This is due to the plugin not properly restricting the roles that users can register with in the mentoring_process_registration() function. This makes it possible for unauthenticated attackers to register with administrator-level user accounts.