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Vulnerability · Published Sep 18, 2026 · Assigned by GitHub_M

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

Critical 9.8

In plain English

A critical-severity missing authorization in icinga2 from Icinga. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.7%top 47.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12icinga2no fix listedDEBIAN-CVE-2026-61550
Debian:13icinga22.14.6-1+deb13u1DEBIAN-CVE-2026-61550
Debian:14icinga22.16.2-1DEBIAN-CVE-2026-61550
Ubuntu:22.04:LTSicinga2no fix listedUBUNTU-CVE-2026-61550
Ubuntu:24.04:LTSicinga2no fix listedUBUNTU-CVE-2026-61550
Ubuntu:26.04:LTSicinga2no fix listedUBUNTU-CVE-2026-61550

Affected products (as reported)

VendorProductVersions
Icinga icinga2 >= 2.8, < 2.14.9>= 2.15.0, < 2.15.4>= 2.16.0, < 2.16.2

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References