The Mailchimp for WooCommerce WordPress plugin before 2.7.2 has an AJAX action that allows high privilege users to perform a POST request on behalf of the server to the internal network/LAN, the body of the request is also appended to the response so it can be used to scan private network for example
https://wpscan.com/vulnerability/f2a59eaa-6b44-4098-912f-823289cf33b0