Improper access control in Icinga - CVE-2026-61550
Published: June 29, 2026 / Updated: September 22, 2026
Vulnerability identifier: #VU135839
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-61550
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to take control over the node.
The vulnerability exists due to improper access control in certificate update JSON-RPC message handling when processing certificate update messages. A remote attacker can send a specially crafted certificate update message to take control over the node.
An attacker can update both the node's own certificate and the trusted CA certificate, enabling impersonation of a trusted node.
Affected software
Icinga
Debian Linux
icinga2 (Debian package)
Debian Linux
icinga2 (Debian package)
How to mitigate CVE-2026-61550
Install security update from vendor's website.
Icinga - addressed in versions 2.14.9, 2.15.4, 2.16.2
icinga2 (Debian package) - update to 2.14.6-1+deb13u1
icinga2 (Debian package) - update to 2.14.6-1+deb13u1