The remote host is vulnerable to a Script Injection attack.
The remote host is running Drupal, a content management system. This version of Drupal is vulnerable to a flaw in the way that it handles user-supplied 'comments'. Specifically, an attacker can embed PHP script code within a comment that would then be executed by the remote webserver. An attacker exploiting this flaw would only need to post a specially formatted comment via the Drupal web interface.
Upgrade or patch according to vendor recommendations.