CVE-2023-0872: Opennms Horizon

High severity, CVSS 8.0. EPSS: 3.3% chance of exploitation in the next 30 days.

The Horizon REST API includes a users endpoint in OpenMNS Horizon 31.0.8 and versions earlier than 32.0.2 on multiple platforms is vulnerable to elevation of privilege. The solution is to upgrade to Meridian 2023.1.6, 2022.1.19, 2021.1.30, 2020.1.38 or Horizon 32.0.2 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. OpenNMS thanks Erik Wynter for reporting this issue.

Affected products

• Opennms Horizon: from 31.0.8, before 32.0.2 (fixed in 32.0.2)
• Opennms Meridian: from 2020.0.0, up to and including 2020.1.37; from 2021.0.0, up to and including 2021.1.29; from 2022.0.0, up to and including 2022.1.18; from 2023.0.0, up to and including 2023.1.5

Published 2023-08-14. Last modified 2026-06-17.