A HTML form was found in this page that looks susceptible to spam attacks. The form has a hidden input form with an email address as value. This is usually an indication that the recipient of an email sending form is hardcoded in a hidden input form. If that's the case this allows malicious users to send email messages using your server without authorization by changing the input value. A malicious spammer could use this tactic to send large numbers of messages anonymously.
The recipient of a email sending form should not be hardcoded in a hidden input value because hidden inputs are controlled by the client. The value should be set on the server side.