CVE-2026-61550CWE-862broken-access-control

CVE-2026-61550

Critical · published September 18, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
51.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00674 · 51.6th percentile
Weakness
CWE-862 · Missing Authorization
Published
2026-09-18T22:17Z
References (10)
https://github.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0 · [email protected]https://github.com/Icinga/icinga2/commit/6c2e0db3819f859910a4ae265461cb51b1d2039c · [email protected]https://github.com/Icinga/icinga2/commit/a6f7cc7a4ef8beed023b24416106822d6940c4c0 · [email protected]https://github.com/Icinga/icinga2/commit/d37b0cfd7d9595ae2f02fadb3d724c98d8620f81 · [email protected]https://github.com/Icinga/icinga2/pull/10907 · [email protected]https://github.com/Icinga/icinga2/releases/tag/v2.14.9 · [email protected]https://github.com/Icinga/icinga2/releases/tag/v2.15.4 · [email protected]https://github.com/Icinga/icinga2/releases/tag/v2.16.2 · [email protected]https://github.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5 · [email protected]https://icinga.com/blog/icinga2-security-release-v2-16-2 · [email protected]
EPSS history
Timeline
  • 20 SEP 03:23Z
    EPSS moved — → 0%
    epss
  • 18 SEP 17:21Z
    Icinga 2: Improper access control for JSON-RPC update certificate messages
    cvelistv5