Zapier for WordPress <= 1.5.1 - Authenticated (Subscriber+) Blind Server-Side Request Forgery via updated_user Function

The Zapier for WordPress plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 1.5.1 via the updated_user() function. 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.