Open redirect vulnerability in the Console in Puppet Enterprise 2015.x and 2016.x before 2016.4.0 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a // (slash slash) followed by a domain in the redirect parameter. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-6501.
https://puppet.com/security/cve/cve-2016-5715
http://www.securityfocus.com/bid/93846
http://www.securityfocus.com/archive/1/539618/100/0/threaded