mod_cluster in JBoss Enterprise Application Platform 5.1.2 for Red Hat Linux allows worker nodes to register with arbitrary virtual hosts, which allows remote attackers to bypass intended access restrictions and provide malicious content, hijack sessions, and steal credentials by registering from an external vhost that does not enforce security constraints.
https://exchange.xforce.ibmcloud.com/vulnerabilities/72460
https://bugzilla.redhat.com/show_bug.cgi?id=767020
http://www.securitytracker.com/id?1026545
http://www.securityfocus.com/bid/51554
http://www.redhat.com/support/errata/RHSA-2012-0040.html
http://www.redhat.com/support/errata/RHSA-2012-0039.html
http://www.redhat.com/support/errata/RHSA-2012-0038.html
http://www.redhat.com/support/errata/RHSA-2012-0037.html