Cross-site scripting (XSS) vulnerability in Pligg 9.9 and earlier allows remote attackers to inject arbitrary web script or HTML via the keyword parameter in a search action to user.php and other unspecified vectors.
https://www.exploit-db.com/exploits/6173
https://exchange.xforce.ibmcloud.com/vulnerabilities/44187
http://www.securityfocus.com/archive/1/494987/100/0/threaded