Duitku Payment Gateway <= 2.11.6 is vulnerable to Missing Authorization via check_duitku_response vulnerability

The Duitku Payment Gateway plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the check_duitku_response function in all versions up to, and including, 2.11.6. This makes it possible for unauthenticated attackers to change the payment status of orders to failed.