Multiple cross-site scripting (XSS) vulnerabilities in the WebApp JSP Snoop page in Mort Bay Jetty 6.1.x through 6.1.21 allow remote attackers to inject arbitrary web script or HTML via the PATH_INFO to the default URI under (1) jspsnoop/, (2) jspsnoop/ERROR/, and (3) jspsnoop/IOException/, and possibly the PATH_INFO to (4) snoop.jsp.