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.
Improper Neutralization of Input During Web Page Generation The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.