Contact Form 7 Extension For Mailchimp <= 0.5.70 - Authenticated (Subscriber+) Server-Side Request Forgery

The Contact Form 7 Extension For Mailchimp plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 0.5.70. This makes it possible for authenticated attackers, with subscriber-level access and above, to make web requests to arbitrary locations originating from the web application which can be used to query and modify information from internal services.