CVE-2026-61550 — Icinga 2: Improper access control for JSON-RPC update certificate messages

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.

Affected products

Vendor	Product	Affected	Fixed
Icinga	icinga2	>= 2.8, < 2.14.9, >= 2.15.0, < 2.15.4, >= 2.16.0, < 2.16.2	—

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗

Release	Package	Fixed in	Advisory
Debian 14	icinga2	2.16.2-1	—
Debian 13	icinga2	2.14.6-1+deb13u1	—
Debian 12	icinga2	No fix yet	—

Ubuntu