Cross-site scripting (XSS) vulnerability in check_user_id.php in ZeroBoard 4.1pl4 and earlier allows remote attackers to inject arbitrary web script or HTML via the user_id parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/18680
http://www.securityfocus.com/bid/12103
http://securitytracker.com/id?1012677
http://secunia.com/advisories/13649
http://marc.info/?l=bugtraq&m=110391024404947&w=2
http://lists.grok.org.uk/pipermail/full-disclosure/2004-December/030224.html