Multiple cross-site scripting (XSS) vulnerabilities in UebiMiau Webmail 2.7.10, and 2.7.2 and earlier allow remote attackers to inject arbitrary web script or HTML via the (1) f_user parameter in index.php, the (2) pag parameter in messages.php, or the (3) lid, (4) tid, and (5) sid parameters in error.php.