{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "2.8"
              },
              {
                "fixed": "2.14.9"
              },
              {
                "introduced": "2.15.0"
              },
              {
                "fixed": "2.15.4"
              },
              {
                "introduced": "2.16.0"
              },
              {
                "fixed": "2.16.2"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "06ed955cb5bcc51179f92fbbd20303428208827b"
            },
            {
              "introduced": "f87948081fc2386fc7a30eb12ab01cb907dbe3fb"
            },
            {
              "introduced": "5855790474c50904efd0c9e31968c04938960a01"
            },
            {
              "fixed": "75b2d7a1c9eacb58e3e3025a6e5f4f573f922d23"
            },
            {
              "fixed": "b4ec974518c9e5f5ca861169442ac3780e675767"
            },
            {
              "fixed": "cfdf63b6331c73fecb2de433022e950cf5184d02"
            },
            {
              "fixed": "4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0"
            },
            {
              "fixed": "6c2e0db3819f859910a4ae265461cb51b1d2039c"
            },
            {
              "fixed": "a6f7cc7a4ef8beed023b24416106822d6940c4c0"
            },
            {
              "fixed": "d37b0cfd7d9595ae2f02fadb3d724c98d8620f81"
            }
          ],
          "repo": "https://github.com/icinga/icinga2",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-vj39-ww8j-vvx5"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61550.json"
  },
  "details": "Icinga 2 is an open source monitoring system. From 2.8 until 2.14.9, 2.15.4, and 2.16.2, certificate update JSON-RPC message handling does not validate that the sender is a trusted endpoint. An unauthenticated network attacker able to connect to TCP port 5665 can replace the node certificate and trusted CA certificate, impersonate a trusted node, and take control of the node. This issue is fixed in versions 2.14.9, 2.15.4, and 2.16.2.",
  "id": "CVE-2026-61550",
  "modified": "2026-09-20T11:30:16.068196599Z",
  "published": "2026-09-18T17:21:18.217Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Icinga/icinga2/releases/tag/v2.14.9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Icinga/icinga2/releases/tag/v2.15.4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Icinga/icinga2/releases/tag/v2.16.2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61550.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-61550"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Icinga/icinga2/commit/6c2e0db3819f859910a4ae265461cb51b1d2039c"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Icinga/icinga2/commit/a6f7cc7a4ef8beed023b24416106822d6940c4c0"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Icinga/icinga2/commit/d37b0cfd7d9595ae2f02fadb3d724c98d8620f81"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Icinga/icinga2/pull/10907"
    },
    {
      "type": "ARTICLE",
      "url": "https://icinga.com/blog/icinga2-security-release-v2-16-2"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Icinga 2: Improper access control for JSON-RPC update certificate messages"
}