The Payment Plugins Braintree For WooCommerce plugin for WordPress is vulnerable to authorization bypass due to a missing capability check on the wc-braintree/v1/3ds/vaultednonce REST API endpoint in all versions up to, and including, 3.2.78. This is due to the endpoint being registered with permissioncallback set to returntrue and processing user-supplied token IDs without verifying ownership or authentication. This makes it possible for unauthenticated attackers to retrieve payment method nonces for any stored payment token in the system, which can be used to create fraudulent transactions, charge customer credit cards, or attach payment methods to other subscriptions.

The Payment Plugins for PayPal WooCommerce WordPress plugin before 2.0.27 does not verify that a PayPal order supplied in a payment request belongs to the WooCommerce order being paid unless that PayPal order has already been completed, allowing unauthenticated attackers to have another buyer's approved but uncaptured payment captured against an order of their own.