Friends < 2.8.6 - Authenticated (Admin+) Blind Server-Side Request Forgery

Description

The Friends plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 2.8.5 via the discover_available_feeds function. 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.