FKIE_CVE-2026-111235

Vulnerability from fkie_nvd - Published: 2026-10-15 19:17 - Updated: 2026-10-16 20:17
Severity
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Summary
An authorization bypass vulnerability exists in the REST API of multiple versions of OpenNMS Meridian and Horizon. The /rest/** Spring Security filter chains authorize requests with intercept-url rules that name the HTTP method as an uppercase token, compare the method case-sensitively, and have no terminal deny rule. A request that uses a non-canonical (for example lowercase) method token matches no rule and is processed without authentication. A remote, unauthenticated attacker can read the monitored inventory and can create, modify, or delete resources through the REST API, which includes injecting events to fabricate or suppress alarms. The /rest/alarms chain has the same missing deny rule and discloses whether an alarm exists through a difference in the response. The fix adds a terminal deny rule to each REST filter chain. The solution is to upgrade to Meridian 2024.3.14, 2025.0.11, 2026.0.1 and Horizon 36.0.5 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.
References
security@opennms.comhttps://github.com/OpenNMS/opennms/pull/8934
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Meridian",
          "repo": "https://github.com/OpenNMS",
          "vendor": "The OpenNMS Group",
          "versions": [
            {
              "lessThan": "2024.3.14",
              "status": "affected",
              "version": "2024.1.0",
              "versionType": "maven"
            },
            {
              "lessThan": "2025.0.11",
              "status": "affected",
              "version": "2025.0.0",
              "versionType": "maven"
            },
            {
              "lessThan": "2026.0.1",
              "status": "affected",
              "version": "2026.0.0",
              "versionType": "maven"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Horizon",
          "repo": "https://github.com/OpenNMS",
          "vendor": "The OpenNMS Group",
          "versions": [
            {
              "lessThan": "36.0.5",
              "status": "affected",
              "version": "36.0.0",
              "versionType": "maven"
            }
          ]
        }
      ],
      "source": "security@opennms.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An authorization bypass vulnerability exists in the REST API of multiple versions of OpenNMS Meridian and Horizon. The /rest/** Spring Security filter chains authorize requests with intercept-url rules that name the HTTP method as an uppercase token, compare the method case-sensitively, and have no terminal deny rule. A request that uses a non-canonical (for example lowercase) method token matches no rule and is processed without authentication. A remote, unauthenticated attacker can read the monitored inventory and can create, modify, or delete resources through the REST API, which includes injecting events to fabricate or suppress alarms. The /rest/alarms chain has the same missing deny rule and discloses whether an alarm exists through a difference in the response. The fix adds a terminal deny rule to each REST filter chain.\n\n\n\nThe solution is to upgrade to Meridian 2024.3.14, 2025.0.11, 2026.0.1 and Horizon 36.0.5 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": "CVE-2026-111235",
  "lastModified": "2026-10-16T20:17:19.620",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2,
        "source": "security@opennms.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-111235",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-16T19:59:23.754367Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-15T19:17:36.693",
  "references": [
    {
      "source": "security@opennms.com",
      "url": "https://github.com/OpenNMS/opennms/pull/8934"
    }
  ],
  "sourceIdentifier": "security@opennms.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-204"
        },
        {
          "lang": "en",
          "value": "CWE-862"
        },
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security@opennms.com",
      "type": "Secondary"
    }
  ]
}



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