The WPeMatico RSS Feed Fetcher plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.8.7. This is due to missing nonce validation in the handle_feedback_submission() function. This makes it possible for unauthenticated attackers to deactivate the plugin via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
https://www.wpematico.com/releases/
https://wordpress.org/plugins/wpematico/#developers
https://plugins.trac.wordpress.org/changeset/3333908/
https://plugins.trac.wordpress.org/browser/wpematico/tags/2.8.7/app/plugin_functions.php#L207