index.php in CubeCart 2.0.4 allows remote attackers to (1) obtain the full path for the web server or (2) conduct cross-site scripting (XSS) attacks via an invalid language parameter, which echoes the parameter in a PHP error message.
https://exchange.xforce.ibmcloud.com/vulnerabilities/19328
http://www.cubecart.com/site/forums/index.php?showtopic=5741