CVE-2026-89054
HighCVSS 8.2Exploitation Probability (EPSS)
Low risk29th percentile - higher than 29% of all known CVEs
Summary
OpenNMS Horizon is missing an authorization rule for the HTTP PATCH method in the Spring Security policy for the /api/v2 REST API. As a result, the event configuration and SNMP data collection endpoints are reachable without authentication, allowing an unauthenticated attacker to disable event definitions and SNMP data collection.
Risk Assessment
An attacker able to reach the web UI can silently disable event and alarm generation and stop metric collection, severely degrading monitoring and detection capabilities.
Recommendation
Upgrade OpenNMS Horizon to version 36.0.4 or newer and ensure the installation is not directly accessible from the Internet, as recommended by the vendor.
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Original NVD description (English source)
A missing authorization vulnerability in OpenNMS Horizon allows configuration changes without authentication. The Spring Security policy for the /api/v2 REST API defines authorization rules for every HTTP method except PATCH, so the shipped @PATCH configuration endpoints for event configuration and SNMP data collection (which enable and disable event definitions and data-collection sources) are reachable with no authorization enforced. An unauthenticated attacker able to reach the web UI can disable event definitions and SNMP data collection, suppressing event and alarm generation and stopping metric collection - silently degrading monitoring and detection - with the change persisted and reloaded into the running system. The solution is to upgrade to Horizon 36.0.4 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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

