Multiple cross-site scripting (XSS) vulnerabilities in the FirstLastNames plugin 1.1.1 for Vanilla Forums allow remote attackers to inject arbitrary web script or HTML via the (1) User/FirstName or (2) User/LastName parameter to the edit user page. NOTE: some of these details are obtained from third party information.
http://www.securityfocus.com/bid/53637
http://www.henryhoggard.co.uk/security/197