Cross-site scripting vulnerability in GoAhead Web Server 2.1 allows remote attackers to execute script as other web users via script in a URL that generates a "404 not found" message, which does not quote the script.
http://www.iss.net/security_center/static/9518.php
http://marc.info/?l=bugtraq&m=102631742711795&w=2
http://freecode.com/projects/embedthis-goahead-webserver/releases/343539
http://archives.neohapsis.com/archives/vulnwatch/2002-q3/0013.html