Multiple cross-site scripting (XSS) vulnerabilities in the Welcart plugin before 1.4.18 for WordPress allow remote attackers to inject arbitrary web script or HTML via the usces_referer parameter to (1) classes/usceshop.class.php (2) includes/edit-form-advanced.php (3) includes/edit-form-advanced30.php (4) includes/edit-form-advanced34.php (5) includes/member_edit_form.php (6) includes/order_edit_form.php (7) includes/order_list.php or (8) includes/usces_item_master_list.php related to admin.php.