The Chikkili- Google Pay India for Woocommerce WordPress plugin through 1.0.6 does not verify that a payment notification actually originated from the payment provider before marking the associated order as paid, allowing unauthenticated attackers to mark arbitrary orders as paid without any payment being made.
https://wpscan.com/vulnerability/d6ee17a1-0db1-4610-8c96-96e98fb734ec/