CVE-2026-61550
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductIcinga2
PublishedSep 18, 2026
First seenSep 18, 2026
Weakness typeCWE-862Missing authorization
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Icinga icinga2 | >= 2.8, < 2.14.9, >= 2.15.0, < 2.15.4, >= 2.16.0, < 2.16.2 | — |
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