source: https://www.securityfocus.com/bid/6750/info A problem with PHP-Nuke could allow remote users to execute arbitrary code in the context of the web site. The problem is in the lack of sanitization of some types of input. PHP-Nuke does not sanitize code submitted to a site from the avatar select box. Due to this, a malicious user may be able to submit embedded code from their profile page instead of an avatar. This would result in code being executed in the location where a user's avatar should normally display. This code would be executed by a victim user's browser in the context of the site.
