Multiple cross-site scripting (XSS) vulnerabilities in Microcart 1.0 allow remote attackers to inject arbitrary web script or HTML via the (1) PATH_INFO or (2) query string to _admin/index.php or (3) first_name (4) last_name (5) cc (6) exp (7) cvv (8) address1 (9) address2 (10) city (11) state (12) zip (13) phone or (14) email parameter to checkout.php which is not properly handled in an error message.