The remote host is missing an update to the system as announced in the referenced advisory.
The following package is affected: WebCalendar
CVE-2006-2762 PHP remote file inclusion vulnerability in includes/config.php in WebCalendar 1.0.3 allows remote attackers to execute arbitrary PHP code via a URL in the includedir parameter, which is remotely accessed in an fopen call whose results are used to define a user_inc setting that is used in an include_once call.
Solution: Update your system with the appropriate patches or software upgrades.