More.groupware PHP script allows remote attackers to include arbitrary files from remote web sites via an HTTP request that sets the includedir variable.
http://www.securityfocus.com/bid/3383
http://www.moregroupware.org/index.php?action=detail&news_id=24
http://www.iss.net/security_center/static/7215.php
http://archives.neohapsis.com/archives/bugtraq/2001-10/0012.html