Vulnerability-Lookup

CVE-2026-89054 (GCVE-0-2026-89054)

Vulnerability from cvelistv5 – Published: 2026-09-10 19:36 – Updated: 2026-09-10 20:03

Title

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

Summary

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.

Severity

8.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-10 20:02 UTC

CWE

CWE-862 - Missing Authorization

Assigner

OpenNMS mitre root

References

1 reference

URL	Tags
https://github.com/OpenNMS/opennms/pull/8833	patch

Impacted products

1 product

Vendor	Product	Version	CPE status
The OpenNMS Group	Horizon	Affected: 36.0.0 , < 36.0.4 (maven)	guessed

Credits

Xanlar Agamalizade

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-89054

Vulnerability from fkie_nvd - Published: 2026-09-10 20:17 - Updated: 2026-09-10 20:17

Severity

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

Summary

References

	URL	Tags
	security@opennms.com	https://github.com/OpenNMS/opennms/pull/8833

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
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    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Horizon",
          "repo": "https://github.com/OpenNMS",
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GHSA-HCPR-9CM8-436X

Vulnerability from github – Published: 2026-09-10 21:31 – Updated: 2026-09-10 21:31

Details

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.

Severity

8.2 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

Show details on source website

JSON

To clipboard

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  "affected": [],
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  ],
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  "modified": "2026-09-10T21:31:36Z",
  "published": "2026-09-10T21:31:36Z",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-89054 (GCVE-0-2026-89054)

FKIE_CVE-2026-89054

GHSA-HCPR-9CM8-436X

Tags

Sightings

Nomenclature