CVE-2026-19182 OpenNMS v2 Alarm REST API inverted authorization check lets ROLE_REST users acknowledge alarms as any user and bypass read-only

An incorrect authorization check in the v2 Alarm REST API in OpenNMS Meridian and Horizon allows a low-privileged authenticated user ROLEREST to acknowledge, escalate, or clear alarms recorded as an arbitrary username, and, when also assigned ROLEREADONLY, to modify alarm state despite the...

CVE-2026-19182: Incorrect Authorization

An incorrect authorization check in the v2 Alarm REST API in OpenNMS Meridian and Horizon allows a low-privileged authenticated user ROLEREST to acknowledge, escalate, or clear alarms recorded as an arbitrary username, and, when also assigned ROLEREADONLY, to modify alarm state despite the...

OpenNMS Horizon 31.0.7 Remote Command Execution

This module requires Metasploit: https://metasploit.com/download Current source: https://github.com/rapid7/metasploit-framework class MetasploitModule 'OpenNMS Horizon Authenticated RCE', 'Description' = %q This module exploits built-in functionality in OpenNMS Horizon in order to execute arbitra...