The Responsive Plus – Starter Templates, Advanced Features and Customizer Settings for Responsive Theme plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 3.1.4 via the 'remote_request' function. This makes it possible for authenticated attackers, with contributor-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.