Multiple cross-site scripting (XSS) vulnerabilities in HESK before 2.4.1 allow remote attackers to inject arbitrary web script or HTML via the (1) hesk_settingstmp_title or (2) hesklangENCODING parameter to inc/header.inc.php; the hesklangattempt parameter to (3) inc/assignment_search.inc.php (4) inc/attachments.inc.php (5) inc/common.inc.php (6) inc/database.inc.php (7) inc/prepare_ticket_search.inc.php (8) inc/print_tickets.inc.php (9) inc/show_admin_nav.inc.php (10) inc/show_search_form.inc.php or (11) inc/ticket_list.inc.php; or (12) the PATH_INFO to language/en/text.php.