Cerberus Helpdesk before 4.0 (Build 600) allows remote attackers to obtain sensitive information via direct requests for "controllers ... that aren't standard helpdesk pages," possibly involving the (1) /display and (2) /kb URIs.
http://www.securityfocus.com/bid/29335
http://www.cerb4.com/blog/2008/05/15/important-security-patch-40-build-599/