Cross-site scripting (XSS) vulnerability in Google Mini Search Appliance, and possibly Google Search Appliance, allows remote attackers to inject arbitrary Javascript, and possibly other web script or HTML, via the proxystylesheet variable, which will be executed in the resulting error message.
http://www.vupen.com/english/advisories/2005/2500
http://www.securityfocus.com/bid/15509
http://www.securityfocus.com/archive/1/417310/30/0/threaded
http://secunia.com/advisories/17644
http://metasploit.com/research/vulns/google_proxystylesheet/