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.
Project Subscriptions
No data.
No advisories yet.
Solution
Upgrade to Horizon 36.0.4 or newer.
Workaround
No workaround given by the vendor.
| Link | Providers |
|---|---|
| https://github.com/OpenNMS/opennms/pull/8833 |
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Thu, 10 Sep 2026 20:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Thu, 10 Sep 2026 19:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | OpenNMS missing authorization on /api/v2 PATCH endpoints allows unauthenticated configuration changes | |
| Weaknesses | CWE-862 | |
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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Status: PUBLISHED
Assigner: OpenNMS
Published:
Updated: 2026-09-10T20:03:12.742Z
Reserved: 2026-09-10T17:29:48.545Z
Link: CVE-2026-89054
Updated: 2026-09-10T20:03:10.007Z
Status : Received
Published: 2026-09-10T20:17:31.973
Modified: 2026-09-10T20:17:31.973
Link: CVE-2026-89054
No data.
OpenCVE Enrichment
No data.