{"schemaVersion":3,"id":"CVE-2026-61550","aliases":["UBUNTU-CVE-2026-61550","DEBIAN-CVE-2026-61550"],"status":"published","duplicateOf":null,"title":null,"description":"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.","dates":{"published":"2026-09-18T17:21:18.217Z","modified":"2026-09-21T20:49:08.713Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","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","exploitability":10,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","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","exploitability":10,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","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","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00674,"percentile":0.51305,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0.304,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.0037},"history":[{"date":"2026-09-19T00:00:00.000Z","score":0.0037,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.0037,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0037,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0037,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0037,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00674,"percentile":0.51305}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.0037,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0037,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0037,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0037,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00674,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00674,"percentile":0.51305}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-862","name":"Missing Authorization","description":"The product does not perform an authorization check when an actor attempts to access a resource or perform an action.","type":"weakness","status":"Incomplete","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/862.html"}],"affected":[{"vendor":"debian","product":"icinga2","name":"icinga2","label":"icinga2","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/icinga2","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 2.14.6-1+deb13u1","noFixRecorded":false,"fixedIn":null},{"text":"< 2.16.2-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 2.14.6-1+deb13u1 | < 2.16.2-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"icinga2","name":"icinga2","label":"icinga2","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/icinga2","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"icinga","product":"icinga2","name":"icinga2","label":"icinga2","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 2.8, < 2.14.9","noFixRecorded":false,"fixedIn":null},{"text":"≥ 2.15.0, < 2.15.4","noFixRecorded":false,"fixedIn":null},{"text":"≥ 2.16.0, < 2.16.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 2.8, < 2.14.9 | ≥ 2.15.0, < 2.15.4 | ≥ 2.16.0, < 2.16.2","eol":null,"hubHref":"/vendor/icinga/icinga2"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5","label":"github.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5","hostname":"github.com","tags":["X Refsource CONFIRM","REPORT"]},{"url":"https://github.com/Icinga/icinga2/pull/10907","label":"github.com/Icinga/icinga2/pull/10907","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0","label":"github.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/Icinga/icinga2/commit/6c2e0db3819f859910a4ae265461cb51b1d2039c","label":"github.com/Icinga/icinga2/commit/6c2e0db3819f859910a4ae265461cb51b1d2039c","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/Icinga/icinga2/commit/a6f7cc7a4ef8beed023b24416106822d6940c4c0","label":"github.com/Icinga/icinga2/commit/a6f7cc7a4ef8beed023b24416106822d6940c4c0","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/Icinga/icinga2/commit/d37b0cfd7d9595ae2f02fadb3d724c98d8620f81","label":"github.com/Icinga/icinga2/commit/d37b0cfd7d9595ae2f02fadb3d724c98d8620f81","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/Icinga/icinga2/releases/tag/v2.14.9","label":"github.com/Icinga/icinga2/releases/tag/v2.14.9","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/Icinga/icinga2/releases/tag/v2.15.4","label":"github.com/Icinga/icinga2/releases/tag/v2.15.4","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/Icinga/icinga2/releases/tag/v2.16.2","label":"github.com/Icinga/icinga2/releases/tag/v2.16.2","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://icinga.com/blog/icinga2-security-release-v2-16-2","label":"icinga.com/blog/icinga2-security-release-v2-16-2","hostname":"icinga.com","tags":["X Refsource MISC"]},{"url":"https://ubuntu.com/security/CVE-2026-61550","label":"ubuntu.com/security/CVE-2026-61550","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-61550","label":"www.cve.org/CVERecord?id=CVE-2026-61550","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://icinga.com/blog/icinga2-security-release-v2-16-2/","label":"icinga.com/blog/icinga2-security-release-v2-16-2/","hostname":"icinga.com","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-61550","label":"security-tracker.debian.org/tracker/CVE-2026-61550","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-09-18T17:21:18.217Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-21T20:49:08.713Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T09:51:27.842Z","stale":false,"partial":false}}