Noah's Classifieds 1.3 allows remote attackers to obtain the installation path via a direct request to include files, as demonstrated by classifieds/gorum/category.php.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24898
http://www.vupen.com/english/advisories/2006/0703
http://www.securityfocus.com/archive/1/425783/100/0/threaded