Cross-site scripting (XSS) vulnerability in TextSearch in WikkaWiki 1.1.6.0 allows remote attackers to inject arbitrary web script or HTML via a hex-encoded phrase parameter.
http://www.vupen.com/english/advisories/2005/2887
http://secunia.com/advisories/18015
http://pridels0.blogspot.com/2005/12/wikkawiki-xss-vuln.html