{"id":"CVE-2026-61550","title":"Icinga 2 is an open source monitoring system","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 endpoint. An unauthenticated network attacker able to co…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-862"],"vendor":"Icinga","product":"icinga2","affected":["icinga2 >= 2.8, < 2.14.9","icinga2 >= 2.15.0, < 2.15.4","icinga2 >= 2.16.0, < 2.16.2"],"published":"2026-09-18","updated":"2026-09-21","sourceUpdated":"2026-09-21T21:17:06.763","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-61550","references":[{"url":"https://github.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0","label":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/commit/6c2e0db3819f859910a4ae265461cb51b1d2039c","label":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/commit/a6f7cc7a4ef8beed023b24416106822d6940c4c0","label":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/commit/d37b0cfd7d9595ae2f02fadb3d724c98d8620f81","label":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/pull/10907","label":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/releases/tag/v2.14.9","label":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/releases/tag/v2.15.4","label":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/releases/tag/v2.16.2","label":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5","label":"security-advisories@github.com"},{"url":"https://icinga.com/blog/icinga2-security-release-v2-16-2","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-21T15:29:22.834072Z"},"epss":0.0037,"epssPercentile":0.30755,"ingestedAt":"2026-09-18T17:46:41.548Z","slug":"CVE-2026-61550","body":"## Overview\n\nIcinga 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}