WPForms Lite 1.10.0.1 - 2.0.2.1 - Unauthenticated Payment Bypass via PayPal Commerce

Description

The plugin does not verify server-side that a payment was completed before accepting a submission on forms using its PayPal Commerce gateway, allowing unauthenticated visitors to submit paid forms without paying. The form's confirmation is delivered and its notification emails are sent even though no order exists at the payment provider and no payment is recorded.