CVE-2026-89054

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Source

https://cve.org/CVERecord?id=CVE-2026-89054

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89054.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-89054

Published

2026-09-10T19:36:21Z

Modified

2026-09-15T08:02:20Z

Severity

8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L CVSS Calculator

Summary

OpenNMS missing authorization on /api/v2 PATCH endpoints allows unauthenticated configuration changes

Details

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.

Database specific

{
    "cna_assigner": "OpenNMS",
    "cwe_ids": [
        "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89054.json"
}

References

Affected packages

Git / github.com/opennms/opennms

Affected ranges

Type

GIT

Repo

https://github.com/opennms/opennms

Events

Introduced

19be3a5ddc789e5f5a58fa58b965544559f3446b

Fixed

f9f84926d8fff42a9ba820d9089c316203ec1002

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "36.0.0"
        },
        {
            "fixed": "36.0.4"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

opennms-36.*

opennms-36.0.0-1

opennms-36.0.1-1

opennms-36.0.2-1

opennms-36.0.3-1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89054.json"

vanir_signatures

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vanir_signatures_modified

"2026-09-15T08:02:20Z"