Multiple cross-site scripting (XSS) vulnerabilities in WebCalendar 1.1.6 allow remote attackers to inject arbitrary web script or HTML via (1) an event description, (2) the query string to pref.php, and (3) the adv parameter to search.php. NOTE: vector 1 requires user authentication.

More... (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2007-6696)