Multiple cross-site scripting (XSS) vulnerabilities in Plume CMS 1.2.4 and earlier allow remote attackers to inject arbitrary web script or HTML via (1) the u_email parameter (aka Authors Email field) to manager/users.php, (2) the u_realname parameter (aka Authors Name field) to manager/users.php, or (3) the c_author parameter (aka Author field) in an ADD A COMMENT section.