Clasifico Listing <= 2.0 - Unauthenticated Privilege Escalation

The Clasifico Listing plugin for WordPress is vulnerable to privilege escalation in versions up to, and including, 2.0. This is due to the plugin allowing users who are registering new accounts to set their own role by supplying the 'listing_user_role' parameter. This makes it possible for unauthenticated attackers to gain elevated privileges by registering an account with the administrator role.