{"id":"CVE-2026-61550","summary":"Icinga 2: Improper access control for JSON-RPC update certificate messages","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.","aliases":["GHSA-vj39-ww8j-vvx5"],"modified":"2026-09-20T11:46:51.994614229Z","published":"2026-09-18T17:21:18.217Z","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"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/icinga/icinga2","events":[{"introduced":"06ed955cb5bcc51179f92fbbd20303428208827b"},{"introduced":"f87948081fc2386fc7a30eb12ab01cb907dbe3fb"},{"introduced":"5855790474c50904efd0c9e31968c04938960a01"},{"fixed":"75b2d7a1c9eacb58e3e3025a6e5f4f573f922d23"},{"fixed":"b4ec974518c9e5f5ca861169442ac3780e675767"},{"fixed":"cfdf63b6331c73fecb2de433022e950cf5184d02"},{"fixed":"4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0"},{"fixed":"6c2e0db3819f859910a4ae265461cb51b1d2039c"},{"fixed":"a6f7cc7a4ef8beed023b24416106822d6940c4c0"},{"fixed":"d37b0cfd7d9595ae2f02fadb3d724c98d8620f81"}],"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"]}}],"versions":["v2.16.1","v2.16.0","v2.15.3","v2.15.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61550.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}