Service Finder Bookings <= 6.0 - Authentication Bypass via User Switch Cookie

The Service Finder Bookings plugin for WordPress is vulnerable to privilege escalation via authentication bypass in all versions up to, and including, 6.0. This is due to the plugin not properly validating a user's cookie value prior to logging them in through the service_finder_switch_back() function. This makes it possible for unauthenticated attackers to login as any user including admins.