TurnkeyForms Web Hosting Directory allows remote attackers to bypass authentication and (1) gain administrative privileges by setting the adm cookie to 1 or (2) gain privileges as another user by setting the logged cookie to the target username.
https://www.exploit-db.com/exploits/7107
https://exchange.xforce.ibmcloud.com/vulnerabilities/46586
http://www.vupen.com/english/advisories/2008/3143