Cross-site scripting (XSS) vulnerability in PRO-search 0.17.1 and earlier allows remote attackers to inject arbitrary web script or HTML via the q parameter to the default URI.
http://www.securityfocus.com/archive/1/482006/100/0/threaded
http://websecurity.com.ua/1224/
http://securityvulns.ru/Sdocument68.html