Truelysell Core <= 1.8.7 - Unauthenticated Privilege Escalation via Registration

The Truelysell Core plugin for WordPress is vulnerable to privilege escalation in versions less than, or equal to, 1.8.7. This is due to insufficient validation of the user_role parameter during user registration. This makes it possible for unauthenticated attackers to create accounts with elevated privileges, including administrator access.