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Vulnerability record · CVE-2026-61550 · published 18 September 2026

CVE-2026-61550: Missing authorization vulnerability

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.

9.8 CVSS 3.1 Critical EPSS 0.67% · top 49.8% CWE-862 · Missing authorization Awaiting Analysis
9.8CVSS 3.1 base score
0.67%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
10References
24 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0
https://github.com/Icinga/icinga2/commit/6c2e0db3819f859910a4ae265461cb51b1d2039c
https://github.com/Icinga/icinga2/commit/a6f7cc7a4ef8beed023b24416106822d6940c4c0
https://github.com/Icinga/icinga2/commit/d37b0cfd7d9595ae2f02fadb3d724c98d8620f81
https://github.com/Icinga/icinga2/pull/10907
https://github.com/Icinga/icinga2/releases/tag/v2.14.9
https://github.com/Icinga/icinga2/releases/tag/v2.15.4
https://github.com/Icinga/icinga2/releases/tag/v2.16.2
https://github.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5
https://icinga.com/blog/icinga2-security-release-v2-16-2

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Source: NIST National Vulnerability Database (record CVE-2026-61550), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.