Multiple cross-site scripting (XSS) vulnerabilities in Dotclear before 2.4.2 allow remote attackers to inject arbitrary web script or HTML via the (1) login_data parameter to admin/auth.php; (2) nb parameter to admin/blogs.php; (3) type, (4) sortby, (5) order, or (6) status parameters to admin/comments.php; or (7) page parameter to admin/plugin.php.