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CVE-2026-61550

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

CVSS 3.1 9.8 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-61550

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-61550

Published

icinga2

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Icinga",
                    "product": "icinga2",
                    "versions": [
                        {
                            "version": ">= 2.8, < 2.14.9",
                            "status": "affected"
                        },
                        {
                            "version": ">= 2.15.0, < 2.15.4",
                            "status": "affected"
                        },
                        {
                            "version": ">= 2.16.0, < 2.16.2",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON