utilities/register.asp in Nukedit 4.9.6 and earlier allows remote attackers to create new users as part of arbitrary groups, including the administrative group, via a modified groupid parameter when creating a user via the addDB action.
https://exchange.xforce.ibmcloud.com/vulnerabilities/26951
http://www.vupen.com/english/advisories/2006/2052
http://www.securityfocus.com/bid/18157
http://www.securityfocus.com/archive/1/435311/100/0/threaded