Cross-site scripting (XSS) vulnerability in Ikonboard 3.1.1 allows remote attackers to inject arbitrary web script or HTML via a private message with a javascript: URL in the IMG tag, in which the URL ends in a ".gif" or ".jpg" string, a variant of CVE-2002-0328.
http://www.iss.net/security_center/static/10268.php
http://archives.neohapsis.com/archives/bugtraq/2002-10/0069.html