PHPChain 1.0 and earlier allows remote attackers to obtain the installation path via invalid values of the catid parameter to (1) settings.php or (2) cat.php, as demonstrated by XSS manipulations.
https://exchange.xforce.ibmcloud.com/vulnerabilities/34019
http://www.vupen.com/english/advisories/2007/1647
http://www.securityfocus.com/bid/23761
http://secunia.com/advisories/25128