Multiple cross-site scripting (XSS) vulnerabilities in ATutor before 1.5.3 allow remote attackers to inject arbitrary web script or HTML via the (1) show_courses or (2) current_cat parameters to (a) admin/create_course.php, show_courses parameter to (b) users/create_course.php, (3) p parameter to (c) documentation/admin/, (4) forgot parameter to (d) password_reminder.php, (5) cat parameter to (e) users/browse.php, or the (6) submit parameter to admin/fix_content.php.