The getObject method of the javax.jms.ObjectMessage class in the (1) JMS Core client, (2) Artemis broker, and (3) Artemis REST component in Apache ActiveMQ Artemis before 1.4.0 might allow remote authenticated users with permission to send messages to the Artemis broker to deserialize arbitrary objects and execute arbitrary code by leveraging gadget classes being present on the Artemis classpath.
https://access.redhat.com/errata/RHSA-2018:1451
https://access.redhat.com/errata/RHSA-2018:1450
https://access.redhat.com/errata/RHSA-2018:1449
https://access.redhat.com/errata/RHSA-2018:1448
https://access.redhat.com/errata/RHSA-2018:1447
https://access.redhat.com/errata/RHSA-2017:3458
https://access.redhat.com/errata/RHSA-2017:3456
https://access.redhat.com/errata/RHSA-2017:3455
https://access.redhat.com/errata/RHSA-2017:3454
https://access.redhat.com/errata/RHSA-2017:1837
https://access.redhat.com/errata/RHSA-2017:1836
https://access.redhat.com/errata/RHSA-2017:1835
https://access.redhat.com/errata/RHSA-2017:1834