PHP remote file inclusion vulnerability in defines.php in WebChat 0.77 allows remote attackers to execute arbitrary PHP code via a URL in the WEBCHATPATH parameter.
https://www.exploit-db.com/exploits/3169
https://exchange.xforce.ibmcloud.com/vulnerabilities/31624
http://www.securitytracker.com/id?1006193
http://www.securityfocus.com/bid/7000
http://www.securityfocus.com/archive/1/313610/30/25700/threaded