source: https://www.securityfocus.com/bid/10082/info
  
NukeCalendar, which is a third-party calendar module for PHP-Nuke, is prone to multiple vulnerabilities.
  
These issues include path disclosure, SQL injection and cross-site scripting. Possible consequences include disclosure of sensitive information and account/bulletin board compromise. Attacks against the database implementation itself are also possible through SQL injection.

http://www.example.com/nuke71/modules.php?op=modload&name=Kalender&file=index&type=view&eid=[xss code here]