CVE-2020-12760: Opennms Horizon

High severity, CVSS 8.8. EPSS: 3.5% chance of exploitation in the next 30 days.

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.

Affected products

• Opennms Opennms Horizon: before 26.1.0 (fixed in 26.1.0)
• Opennms Opennms Meridian: before 2018.1.19 (fixed in 2018.1.19); from 2019, before 2019.1.7 (fixed in 2019.1.7)

Published 2020-05-11. Last modified 2026-06-17.