BCK Auto-confirm Bank Transfer <= 2.0.1 - Unauthenticated WooCommerce Order Payment Confirmation

The Thanh Toán Quét Mã QR Code Tự Động WordPress plugin through 2.0.1 does not properly verify the authenticity of incoming bank-transfer payment notifications on a default installation, allowing unauthenticated attackers to mark arbitrary WooCommerce orders as paid.