CVE-2026-61550— Icinga 2: Improper access control for JSON-RPC update certificate messages
Quick assessment
Affected
Icinga icinga2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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
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I. Basic Information for CVE-2026-61550
Vulnerability Information
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Vulnerability Title
Icinga 2: Improper access control for JSON-RPC update certificate messages
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-61550
| # | POC Description | Source Link | Shenlong Link |
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Patches & Fixes for CVE-2026-61550 (5)
Vendor Advisories for CVE-2026-61550 (1)
Security Blog Posts for CVE-2026-61550 (1)
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Releasing Icinga 2 v2.16.2, 2.15.4 and 2.14.9 x_refsource_MISC
Other References for CVE-2026-61550 (3)
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Release Icinga 2 v2.15.4 · Icinga/icinga2 · GitHub x_refsource_MISC
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Release Icinga 2 v2.16.2 · Icinga/icinga2 · GitHub x_refsource_MISC
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Release Icinga 2 v2.14.9 · Icinga/icinga2 · GitHub x_refsource_MISC
Same Patch Batch · Icinga · 2026-09-18 · 3 CVEs total
| CVE-2026-61551 | 8.6 HIGH | Icinga 2: Stack overflow via deeply nested JSON objects |
| CVE-2026-61552 | 7.2 HIGH | Icinga 2 DSL Injection via Unescaped Import Template Name |
IV. Related Vulnerabilities
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V. Comments for CVE-2026-61550
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