The B Carousel Block – Responsive Image and Content Carousel plugin for WordPress is vulnerable to Server-Side Request Forgery in versions up to, and including, 1.1.5. This is due to the plugin not validating user-supplied URLs before passing them to the wp_remote_request() 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 and can be used to query and modify information from internal services.
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.