Smart Proxy (aka Smart-Proxy and foreman-proxy) in Foreman before 1.5.4 and 1.6.x before 1.6.2 does not validate SSL certificates, which allows remote attackers to bypass intended authentication and execute arbitrary API requests via a request without a certificate.
https://groups.google.com/forum/#%21topic/foreman-announce/jXC5ixybjqo
https://github.com/theforeman/smart-proxy/pull/217
http://rhn.redhat.com/errata/RHSA-2015-0288.html