The MxChat – AI Chatbot for WordPress plugin for WordPress is vulnerable to Blind Server-Side Request Forgery in all versions up to, and including, 2.4.6. This is due to insufficient validation of user-supplied URLs in the PDF processing functionality. This makes it possible for unauthenticated attackers to make the WordPress server perform HTTP requests to arbitrary destinations via the mxchat_handle_chat_request AJAX action.
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.