What is CVE-2026-19182?

CVE-2026-19182 is a medium-severity vulnerability in The Opennms Group Horizon, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-08-13.

How severe is CVE-2026-19182?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in The Opennms Group Horizon

CVE-2026-19182

An incorrect authorization check in the v2 Alarm REST API in OpenNMS Meridian and Horizon allows a low-privileged authenticated user (ROLE_REST) to acknowledge, escalate, or clear alarms recorded as an arbitrary username, and, when also as…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

Affected products

The Opennms Group Horizon — versions 36.0.0
The Opennms Group Meridian — versions 2024.1.0, 2025.0.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

security@opennms.com (patch)

Frequently asked questions

What is CVE-2026-19182?: CVE-2026-19182 is a medium-severity vulnerability in The Opennms Group Horizon, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-08-13.
How severe is CVE-2026-19182?: Medium severity. CVSS v3 base score is 4.3 out of 10.