Zen Cart before 1.2.7 does not protect the admin/includes directory, which allows remote attackers to cause unknown impact via unspecified vectors, probably direct requests.
Cross-site scripting (XSS) vulnerability in zcinstall/includes/modules/pages/databasesetup/headerphp.php in Zen Cart 1.5.0 and earlier, when the software is being installed, allows remote attackers to inject arbitrary web script or HTML via the dbusername parameter to zcinstall/index.php.