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.