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CVE-2026-89054

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

High8.2EPSS 0.51%
Published
Updated
Reserved
Assigned by
OpenNMS

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.

Scores

CVSS scores of CVE-2026-89054, by who scored it
Scored byCVSSScoreVector
OpenNMSCNA (assigner)3.1High8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
NVDNVD · Awaiting Analysis3.1High8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
EPSS (exploitation in 30 days)
0.51% · top 56% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.2.

Weakness

Affected products

What to do

Solution: Upgrade to Horizon 36.0.4 or newer.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .