CVE-2016-0733
The Admin UI in Apache Ranger before 0.5.1 does not properly handle authentication requests that lack a password, which allows remote attackers to bypass authentication by leveraging knowledge of a valid username.
Date published : 2016-04-12
http://www.securityfocus.com/bid/82871
https://cwiki.apache.org/confluence/display/RANGER/Vulnerabilities+found+in+Ranger