Multiple directory traversal vulnerabilities in Pligg 9.9 and earlier allow remote attackers to (1) determine the existence of arbitrary files via a .. (dot dot) in the $tb_url variable in trackback.php, or (2) include arbitrary files via a .. (dot dot) in the template parameter to settemplate.php.
https://www.exploit-db.com/exploits/6173
https://exchange.xforce.ibmcloud.com/vulnerabilities/44191
https://exchange.xforce.ibmcloud.com/vulnerabilities/44190
http://www.securityfocus.com/archive/1/494987/100/0/threaded