The Contact Form by Bit Form: Multi Step Form, Calculation Contact Form, Payment Contact Form & Custom Contact Form builder plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 2.17.4 via the Webhooks integration. This makes it possible for authenticated attackers, with Administrator-level access and above, to make web requests to arbitrary locations originating from the web application and can be used to query and modify information from internal services. The vulnerability can also be exploited in Multisite environments.