An issue was discovered in OpenNMS Horizon before 26.0.1, and Meridian before 2018.1.19 and 2019 before 2019.1.7. The ActiveMQ channel configuration allowed for arbitrary deserialization of Java objects (aka ActiveMQ Minion payload deserialization), leading to remote code execution for any authenticated channel user regardless of its assigned permissions.
github.com/OpenNMS/opennms
github.com/OpenNMS/opennms/commit/e21fc14ce355533493da0db815bd81a66e291382
github.com/OpenNMS/opennms/pull/2983
github.com/OpenNMS/opennms/releases/tag/opennms-26.0.1-1
issues.opennms.org/browse/NMS-12673
nvd.nist.gov/vuln/detail/CVE-2020-12760
www.opennms.com/en/blog/2020-04-29-opennms-horizon-26-0-1-luchador-released
www.opennms.com/en/blog/2020-04-29-opennms-meridian-2018-1-18-wildfire-released
www.opennms.com/en/blog/2020-04-29-opennms-meridian-2019-1-6-europa-released