The Forminator Forms WordPress plugin before 1.57.2.1 does not perform a nonce, capability or ownership check before running a one-time payment-field migration during the construction of one of its admin screens, and that construction happens on every wp-admin request for any logged-in user. Any authenticated user, including a Subscriber with no permissions in the Forminator Forms WordPress plugin before 1.57.2.1, can therefore rewrite the saved field configuration of any form on the site, including a live payment form.
Analyzing vulnerability vectors…