# OpenNMS Horizon vulnerabilities

Source: https://junglewise.ai/threats/technologies/opennms-horizon  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/opennms-horizon.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 4 vulnerabilities in OpenNMS Horizon: 2 in the last 7 days and 4 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-127236, was published on 12 November 2026. 2 vulnerabilities in the last four weeks, up from none in the four before. 1 critical against 0.

## Counts

- Last 7 days: 2
- Last 30 days: 4
- Last 90 days: 4
- All time: 4 (1 critical, 0 exploited in the wild)

## Latest OpenNMS Horizon vulnerabilities

- [CVE-2026-127236: OpenNMS Meridian and Horizon argument injection in RRD graph](https://junglewise.ai/threats/cve-2026-127236-an-argument-injection-vulnerability-exists-in-the-ad-hoc-rrd) (medium, CVSS 5.4, published 12 Nov 2026)
- [CVE-2026-127235: OpenNMS Meridian and Horizon reflected cross-site scripting in web UI](https://junglewise.ai/threats/cve-2026-127235-a-reflected-cross-site-scripting-vulnerability-exists-in-the-web) (medium, CVSS 6.1, published 12 Nov 2026)
- [CVE-2026-111252: OpenNMS Meridian and Horizon XML entity expansion denial of service](https://junglewise.ai/threats/cve-2026-111252-a-denial-of-service-vulnerability-exists-in-the-xml-parsing-of) (medium, CVSS 6.5, published 15 Oct 2026)
- [CVE-2026-111235: OpenNMS Meridian and Horizon REST API authorization bypass](https://junglewise.ai/threats/cve-2026-111235-an-authorization-bypass-vulnerability-exists-in-the-rest-api-of) (critical, CVSS 9.1, published 15 Oct 2026)

## Most severe OpenNMS Horizon vulnerabilities

- [CVE-2026-111235: OpenNMS Meridian and Horizon REST API authorization bypass](https://junglewise.ai/threats/cve-2026-111235-an-authorization-bypass-vulnerability-exists-in-the-rest-api-of) (critical, CVSS 9.1, published 15 Oct 2026)
- [CVE-2026-111252: OpenNMS Meridian and Horizon XML entity expansion denial of service](https://junglewise.ai/threats/cve-2026-111252-a-denial-of-service-vulnerability-exists-in-the-xml-parsing-of) (medium, CVSS 6.5, published 15 Oct 2026)
- [CVE-2026-127235: OpenNMS Meridian and Horizon reflected cross-site scripting in web UI](https://junglewise.ai/threats/cve-2026-127235-a-reflected-cross-site-scripting-vulnerability-exists-in-the-web) (medium, CVSS 6.1, published 12 Nov 2026)
- [CVE-2026-127236: OpenNMS Meridian and Horizon argument injection in RRD graph](https://junglewise.ai/threats/cve-2026-127236-an-argument-injection-vulnerability-exists-in-the-ad-hoc-rrd) (medium, CVSS 5.4, published 12 Nov 2026)

## Vulnerabilities per week

2 vulnerabilities in the last four weeks, up from none in the four before. 1 critical against 0.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 2 | 1 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 2 | 0 | 0 |

## Other OpenNMS technologies

- [OpenNMS Meridian](https://junglewise.ai/threats/technologies/meridian): 6 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "OpenNMS Horizon vulnerabilities", https://junglewise.ai/threats/technologies/opennms-horizon, 13 November 2026.