CVE-2026-61550

CRITICAL 9.8

Icinga 2: Improper access control for JSON-RPC update certificate messages

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-862
Vendor	icinga
Product	icinga2
Published	Sep 18, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Icinga / icinga2

>= 2.8, < 2.14.9 >= 2.15.0, < 2.15.4 >= 2.16.0, < 2.16.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗