Provide references for CVE-2015-7666.
Where can I find more information about CVE-2015-7666?
References are available at: https://wordpress.org/plugins/payment-form-for-paypal-pro/#developers, https://wpvulndb.com/vulnerabilities/8210, http://www.securityfocus.com/archive/1/536602/100/0/threaded, https://plugins.trac.wordpress.org/changeset/1254452/payment-form-for-paypal-pro.