A cross-site scripting vulnerability in test-plugin.php in the Swipe Checkout for WooCommerce plugin 2.7.1 and earlier for WordPress allows remote attackers to inject arbitrary web script or HTML via the api_url parameter.
View the template here CVE-2014-4558.yaml
References:
http://codevigilant.com/disclosure/wp-plugin-swipehq-payment-gateway-woocommerce-a3-cross-site-scripting-xss