admin/index.php in AV Arcade 2.1b grants administrative privileges when the ava_userid cookie value is 1, which allows remote attackers to perform certain administrative actions.
https://exchange.xforce.ibmcloud.com/vulnerabilities/35234
http://www.securityfocus.com/bid/24736/info
http://www.securityfocus.com/archive/1/472666/100/0/threaded