UniPAY Payment Gateway For WooCommerce < 2.4 - Unauthenticated Order Key and Customer PII Disclosure

The UniPAY Payment Gateway For WooCommerce WordPress plugin before 2.4 does not perform any authorization check before returning an order's order-received URL for an attacker-supplied order id, exposing the order's secret key in the redirect and allowing unauthenticated attackers to enumerate orders and disclose customers' personal data (name, email address, phone number and address).