Cryptocurrency Payment Gateway for WooCommerce <= 2.0.25 - Missing Authorization to Unauthenticated Tracking Status Update

The Cryptocurrency Payment Gateway for WooCommerce plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'handle_optin_optout' function in all versions up to, and including, 2.0.25. This makes it possible for unauthenticated attackers to opt in and out of tracking.