It was found that JGroups did not require necessary headers for encrypt and auth protocols from new nodes joining the cluster. An attacker could use this flaw to bypass security restrictions, and use this vulnerability to send and receive messages within the cluster, leading to information disclosure, message spoofing, or further possible attacks.
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
https://rhn.redhat.com/errata/RHSA-2016-1334.html
https://rhn.redhat.com/errata/RHSA-2016-1332.html
https://rhn.redhat.com/errata/RHSA-2016-1330.html
https://rhn.redhat.com/errata/RHSA-2016-1328.html
https://issues.jboss.org/browse/JGRP-2021
https://access.redhat.com/errata/RHSA-2016:1434
https://access.redhat.com/errata/RHSA-2016:1433
https://access.redhat.com/errata/RHSA-2016:1432
https://access.redhat.com/errata/RHSA-2016:1389
https://access.redhat.com/errata/RHSA-2016:1376
https://access.redhat.com/errata/RHSA-2016:1374
https://access.redhat.com/errata/RHSA-2016:1347
https://access.redhat.com/errata/RHSA-2016:1346
https://access.redhat.com/errata/RHSA-2016:1345
http://www.securityfocus.com/bid/91481
http://rhn.redhat.com/errata/RHSA-2016-2035.html