The Podcast Player WordPress plugin before 8.3.1 does not validate the destination of a server-side request built from user-supplied input, allowing unauthenticated attackers to make the server issue requests to arbitrary hosts and read back responses that parse as RSS/XML.
Weakness
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.