NotificationX < 3.3.7 - Unauthenticated Settings Update and Email Sending via send-rating REST Route
The NotificationX WordPress plugin before 3.3.7 does not perform any capability or nonce check on one of its REST routes, allowing unauthenticated users to update a NotificationX WordPress plugin before 3.3.7 option and to repeatedly trigger emails sent through the site's own mail server.