The Razorpay for WooCommerce WordPress plugin before 4.8.9 does not perform an authorization check on one of its REST routes and derives the acting user's identity from an unauthenticated request parameter, allowing an unauthenticated attacker to cause the request to execute as an arbitrary user account for the duration of the request. Exploitation additionally requires a specific coupon Razorpay for WooCommerce WordPress plugin before 4.8.9 to be active on the site.