Directory traversal vulnerability in help/index.php in X7 Chat 2.0 and earlier allows remote attackers to include arbitrary files via .. (dot dot) sequences in the help_file parameter.
https://www.exploit-db.com/exploits/1738
https://exchange.xforce.ibmcloud.com/vulnerabilities/26218
http://www.vupen.com/english/advisories/2006/1608
http://www.securityfocus.com/archive/1/432716/100/0/threaded