Cross-site scripting (XSS) vulnerability in Search/DisplayResults.php in PHP JackKnife 2.21 and earlier allows remote attackers to inject arbitrary web script or HTML via URL-encoded values in the sKeywords parameter.
http://www.vupen.com/english/advisories/2005/2877
http://secunia.com/advisories/18020
http://pridels0.blogspot.com/2005/12/php-jackknife-xss-vuln.html