Cross-site scripting (XSS) vulnerability in block-Forums.php in the Splatt Forum module for PHP-Nuke 6.x allows remote attackers to inject arbitrary web script or HTML via the subject parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/11675
http://www.securityfocus.com/bid/7248
http://www.securityfocus.com/archive/1/317230/30/25220/threaded
http://www.securityfocus.com/archive/1/316925/30/25250/threaded