Vulnerability-Lookup

GHSA-9C84-8R2J-9227

Vulnerability from github – Published: 2026-11-12 21:31 – Updated: 2026-11-12 21:31

Details

The solution is to upgrade to Meridian 2024.3.15, 2025.0.12, 2026.0.2 and Horizon 36.0.6 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

6.1 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-127235"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-11-12T19:17:03Z",
    "severity": "MODERATE"
  },
  "details": "A reflected cross-site scripting vulnerability exists in the web user interface of multiple versions of OpenNMS Meridian and Horizon. Several web UI pages copy request parameter values into the HTML response without correct contextual output encoding. A remote attacker can craft a link that runs arbitrary JavaScript in the OpenNMS origin when an authenticated user opens it. The script runs in the victim\u0027s browser with the victim\u0027s session, so the attacker can read page data and send same-origin requests as the victim. The fix encodes the affected request values. On pages that use AngularJS, the fix also stops client-side template evaluation of the reflected values.\n\n\n\nThe solution is to upgrade to Meridian 2024.3.15, 2025.0.12, 2026.0.2 and Horizon 36.0.6 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization\u0027s private networks and should not be directly accessible from the Internet.",
  "id": "GHSA-9c84-8r2j-9227",
  "modified": "2026-11-12T21:31:26Z",
  "published": "2026-11-12T21:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-127235"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OpenNMS/opennms/pull/9066"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-127235 (GCVE-0-2026-127235)

Vulnerability from cvelistv5 – Published: 2026-11-12 18:06 – Updated: 2026-11-12 18:06

Title

OpenNMS reflected cross-site scripting in the web UI via request parameters

Summary

A reflected cross-site scripting vulnerability exists in the web user interface of multiple versions of OpenNMS Meridian and Horizon. Several web UI pages copy request parameter values into the HTML response without correct contextual output encoding. A remote attacker can craft a link that runs arbitrary JavaScript in the OpenNMS origin when an authenticated user opens it. The script runs in the victim's browser with the victim's session, so the attacker can read page data and send same-origin requests as the victim. The fix encodes the affected request values. On pages that use AngularJS, the fix also stops client-side template evaluation of the reflected values. The solution is to upgrade to Meridian 2024.3.15, 2025.0.12, 2026.0.2 and Horizon 36.0.6 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

6.1 (Medium)


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

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

OpenNMS CNA under the mitre root

CNA scorecard – unranked: 9 records in the last 180 days, 10 needed details

References

1 reference

URL	Tags
https://github.com/OpenNMS/opennms/pull/9066	patch

Impacted products

2 products

Vendor	Product	Version
The OpenNMS Group	Meridian	Affected: 2024.1.0 , < 2024.3.15 (maven) Affected: 2025.0.0 , < 2025.0.12 (maven) Affected: 2026.0.0 , < 2026.0.2 (maven)
The OpenNMS Group	Horizon	Affected: 36.0.0 , < 36.0.6 (maven)

Credits

Andrew Melek

Show details on NVD website

JSON

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  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Meridian",
          "repo": "https://github.com/OpenNMS",
          "vendor": "The OpenNMS Group",
          "versions": [
            {
              "lessThan": "2024.3.15",
              "status": "affected",
              "version": "2024.1.0",
              "versionType": "maven"
            },
            {
              "lessThan": "2025.0.12",
              "status": "affected",
              "version": "2025.0.0",
              "versionType": "maven"
            },
            {
              "lessThan": "2026.0.2",
              "status": "affected",
              "version": "2026.0.0",
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            }
          ]
        },
        {
          "defaultStatus": "unaffected",
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          "vendor": "The OpenNMS Group",
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            {
              "lessThan": "36.0.6",
              "status": "affected",
              "version": "36.0.0",
              "versionType": "maven"
            }
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        }
      ],
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          "type": "finder",
          "value": "Andrew Melek"
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        }
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          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
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            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
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            "userInteraction": "REQUIRED",
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              "cweId": "CWE-79",
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      "providerMetadata": {
        "dateUpdated": "2026-11-12T18:06:04.618Z",
        "orgId": "70b007e9-5235-4ee5-90b5-a71a81beeda0",
        "shortName": "OpenNMS"
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      "references": [
        {
          "tags": [
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          "url": "https://github.com/OpenNMS/opennms/pull/9066"
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            }
          ],
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      "source": {
        "discovery": "EXTERNAL"
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    "dateReserved": "2026-11-12T17:14:27.854Z",
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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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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