CVE-2023-0870: Opennms Horizon

Medium severity, CVSS 6.7. EPSS: 0.3% chance of exploitation in the next 30 days.

A form can be manipulated with cross-site request forgery in multiple versions of OpenNMS Meridian and Horizon. This can potentially allow an attacker to gain access to confidential information and compromise integrity. The solution is to upgrade to Meridian 2023.1.1 or Horizon 31.0.6 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization's private networks and should not be directly accessible from the Internet.

Affected products

• Opennms Horizon: before 31.0.6 (fixed in 31.0.6)
• Opennms Meridian: from 2020.1.0, before 2020.1.33 (fixed in 2020.1.33); from 2021.1.0, before 2021.1.25 (fixed in 2021.1.25); from 2022.1.0, before 2022.1.14 (fixed in 2022.1.14); version 2023.1.0 only

Published 2023-03-22. Last modified 2026-06-17.