Multiple cross-site scripting (XSS) vulnerabilities in Piwik before 1.1 allow remote attackers to inject arbitrary web script or HTML via unspecified vectors.
http://www.vupen.com/english/advisories/2011/0013
http://www.securityfocus.com/bid/45659
http://secunia.com/advisories/42809
http://piwik.org/blog/2011/01/professional-security-audit-in-piwik/
http://piwik.org/blog/2011/01/piwik-1-1-security-advisory/
http://piwik.org/blog/2011/01/piwik-1-1-2/