The ProfileGrid – User Profiles, Groups and Communities plugin for WordPress is vulnerable to Limited Server-Side Request Forgery in all versions up to, and including, 5.9.4.2 via the pm_upload_image 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 download and view images, as well as validating if a non-image file exists, both on local or remote hosts.
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.