CVE-2026-61550: CWE-862: Missing Authorization in Icinga icinga2
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.
AI Analysis
Technical Summary
CVE-2026-61550 is a missing authorization vulnerability (CWE-862) in Icinga 2's certificate update JSON-RPC message handling. From versions 2.8 until fixed versions 2.14.9, 2.15.4, and 2.16.2, the software does not verify that the sender of certificate update messages is a trusted endpoint. This allows an unauthenticated network attacker with access to TCP port 5665 to replace the node certificate and trusted CA certificate, effectively impersonating a trusted node and gaining control over the node. The vulnerability is rated critical with a CVSS 3.1 score of 9.8 (network attack vector, low complexity, no privileges or user interaction required, high confidentiality, integrity, and availability impact).
Potential Impact
An unauthenticated attacker able to connect to TCP port 5665 can replace critical certificates, impersonate trusted nodes, and take control of the affected Icinga 2 node. This compromises the confidentiality, integrity, and availability of the node and potentially the monitoring infrastructure relying on it.
Mitigation Recommendations
This vulnerability is fixed in Icinga 2 versions 2.14.9, 2.15.4, and 2.16.2. Users should upgrade to these or later versions to remediate the issue. No other mitigations are indicated by the vendor advisory.
CVE-2026-61550: CWE-862: Missing Authorization in Icinga icinga2
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.
CVSS v3.1
Score 9.8critical
Affected software
Icinga
icinga2
pkg:github/icinga/icinga2Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-61550 is a missing authorization vulnerability (CWE-862) in Icinga 2's certificate update JSON-RPC message handling. From versions 2.8 until fixed versions 2.14.9, 2.15.4, and 2.16.2, the software does not verify that the sender of certificate update messages is a trusted endpoint. This allows an unauthenticated network attacker with access to TCP port 5665 to replace the node certificate and trusted CA certificate, effectively impersonating a trusted node and gaining control over the node. The vulnerability is rated critical with a CVSS 3.1 score of 9.8 (network attack vector, low complexity, no privileges or user interaction required, high confidentiality, integrity, and availability impact).
Potential Impact
An unauthenticated attacker able to connect to TCP port 5665 can replace critical certificates, impersonate trusted nodes, and take control of the affected Icinga 2 node. This compromises the confidentiality, integrity, and availability of the node and potentially the monitoring infrastructure relying on it.
Mitigation Recommendations
This vulnerability is fixed in Icinga 2 versions 2.14.9, 2.15.4, and 2.16.2. Users should upgrade to these or later versions to remediate the issue. No other mitigations are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-10T16:48:39.922Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aad759d55bf5e2cf54f30a3
Added to database: 09/18/2026, 17:32:13 UTC
Last enriched: 09/18/2026, 17:47:47 UTC
Last updated: 09/18/2026, 23:35:52 UTC
Views: 10
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