Kayako liveResponse 2.x allows remote attackers to obtain sensitive information via a direct request to addressbook.php and other include scripts, which reveals the path in an error message.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-2464
http://www.securityfocus.com/bid/14425
http://www.gulftech.org/?node=research&article_id=00092-07302005