PHP remote file inclusion vulnerability in addcode.php in HIOX Star Rating System Script (HSRS) 1.0 and earlier allows remote attackers to execute arbitrary PHP code via a URL in the hm parameter.
https://www.exploit-db.com/exploits/2838
https://exchange.xforce.ibmcloud.com/vulnerabilities/30527
http://www.vupen.com/english/advisories/2006/4689
http://www.securityfocus.com/archive/1/494928/100/0/threaded