Cross-site scripting (XSS) vulnerability in user.php in PostNuke 0.64 allows remote attackers to inject arbitrary web script or HTML via the uname parameter.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2001-1498
http://www.securityfocus.com/bid/3609
http://www.iss.net/security_center/static/7654.php