{"id":"CVE-2026-61550","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-61550","summary":"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…","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.","published":"2026-09-18T18:17:08.217","modified":"2026-09-18T18:17:08.217","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0","label":"Icinga/icinga2@4b7fb34"},"references":[{"type":"WEB","url":"https://github.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0"},{"type":"WEB","url":"https://github.com/Icinga/icinga2/commit/6c2e0db3819f859910a4ae265461cb51b1d2039c"},{"type":"WEB","url":"https://github.com/Icinga/icinga2/commit/a6f7cc7a4ef8beed023b24416106822d6940c4c0"},{"type":"WEB","url":"https://github.com/Icinga/icinga2/commit/d37b0cfd7d9595ae2f02fadb3d724c98d8620f81"},{"type":"WEB","url":"https://github.com/Icinga/icinga2/pull/10907"},{"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":"WEB","url":"https://github.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5"},{"type":"WEB","url":"https://icinga.com/blog/icinga2-security-release-v2-16-2"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-18T18:17:08.217"}}