PHP remote file inclusion vulnerability in (1) index.php and (2) admin/index.php in IPrimal Forums as of 20061105 allows remote attackers to execute arbitrary PHP code via a URL in the p parameter.
https://www.exploit-db.com/exploits/2739
https://exchange.xforce.ibmcloud.com/vulnerabilities/30074
http://www.vupen.com/english/advisories/2006/4383
http://www.securityfocus.com/bid/20966
http://www.securityfocus.com/archive/1/452137/100/200/threaded