The uploads module in vTiger CRM 4.2 and earlier allows remote attackers to upload arbitrary files, such as PHP files, via the add2db action.
http://www.vupen.com/english/advisories/2005/2569
http://www.securityfocus.com/bid/15569
http://www.securityfocus.com/archive/1/417711/30/0/threaded
http://securitytracker.com/id?1015274