Apache Shiro before 1.2.5, when a cipher key has not been configured for the "remember me" feature, allows remote attackers to execute arbitrary code or bypass intended access restrictions via an unspecified request parameter.
http://rhn.redhat.com/errata/RHSA-2016-2036.html
http://rhn.redhat.com/errata/RHSA-2016-2035.html
http://packetstormsecurity.com/files/137310/Apache-Shiro-1.2.4-Information-Disclosure.html