CS-Forum before 0.82 allows remote attackers to obtain sensitive information via unspecified manipulations, possibly involving an empty collapse[] or readall parameter to index.php, which reveals the installation path in an error message.
https://exchange.xforce.ibmcloud.com/vulnerabilities/27178
http://www.vupen.com/english/advisories/2006/2314
http://www.securityfocus.com/archive/1/436789/100/0/threaded
http://www.comscripts.com/scripts/php.cs-forum.643.html