The WPeMatico RSS Feed Fetcher plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 2.8.11 via the wpematico_test_feed() 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.
https://plugins.trac.wordpress.org/browser/wpematico/tags/2.8.11/app/wpematico_functions.php#L1260
https://plugins.trac.wordpress.org/browser/wpematico/tags/2.8.11/app/wpematico_functions.php#L1249
https://plugins.trac.wordpress.org/browser/wpematico/tags/2.8.11/app/campaign_edit.php#L24
https://github.com/etruel/wpematico/commit/7a281dcfc0868490d62caee54f3b743708fed7cf