Order Tip for WooCommerce <= 1.3.1 - Missing Authorization to Unauthenticated Data Export

The Order Tip for WooCommerce plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the export_tips_to_csv() function in all versions up to, and including, 1.3.1. This makes it possible for unauthenticated attackers to export the plugin's order fees.