Multiple directory traversal vulnerabilities in MERAK Mail Server 8.2.4r with Icewarp Web Mail 5.5.1, and possibly earlier versions, allows remote attackers to (1) delete arbitrary files or directories via a relative path to the id parameter to logout.html or (2) include arbitrary PHP files or other files via the helpid parameter to help.html.
http://www.vupen.com/english/advisories/2005/1933
http://www.securityfocus.com/bid/14986