CVE-2026-61550

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7%, top 50% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
50%
KEV
Not listed

Published

September 18, 2026

Last Modified

September 24, 2026

Advisory Details (10)

Auto-updated Sep 24, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
generic

Releasing Icinga 2 v2.16.2, 2.15.4 and 2.14.9

https://icinga.com/blog/icinga2-security-release-v2-16-2
github Patch Available

Improper access control for JSON-RPC update certificate messages · Advisory · Icinga/icinga2 · GitHub

https://github.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5
github_release Patch Available

Icinga 2 v2.16.2

Patch available: Icinga/icinga2 v2.16.2

https://github.com/Icinga/icinga2/releases/tag/v2.16.2
github_release Patch Available

Icinga 2 v2.15.4

Patch available: Icinga/icinga2 v2.15.4

https://github.com/Icinga/icinga2/releases/tag/v2.15.4
github_release Patch Available

Icinga 2 v2.14.9

Patch available: Icinga/icinga2 v2.14.9

https://github.com/Icinga/icinga2/releases/tag/v2.14.9
github_pr

[GHSA-vj39-ww8j-vvx5] Checking if certificate update request comes from a valid endpoint

Fix merged in Icinga/icinga2 PR #10907 on 2026-06-29 — awaiting tagged release

https://github.com/Icinga/icinga2/pull/10907
github_commit Patch Available

commit d37b0cfd7d95 (Icinga/icinga2)

Patch available: Icinga/icinga2 v2.15.4 (contains commit d37b0cfd7d95)

https://github.com/Icinga/icinga2/commit/d37b0cfd7d9595ae2f02fadb3d724c98d8620f81
github_commit Patch Available

commit a6f7cc7a4ef8 (Icinga/icinga2)

Patch available: Icinga/icinga2 v2.16.2 (contains commit a6f7cc7a4ef8)

https://github.com/Icinga/icinga2/commit/a6f7cc7a4ef8beed023b24416106822d6940c4c0
github_commit

commit 6c2e0db3819f (Icinga/icinga2)

Fix landed in Icinga/icinga2 commit 6c2e0db3819f — awaiting tagged release

https://github.com/Icinga/icinga2/commit/6c2e0db3819f859910a4ae265461cb51b1d2039c
github_commit Patch Available

commit 4b7fb3405f46 (Icinga/icinga2)

Patch available: Icinga/icinga2 v2.14.9 (contains commit 4b7fb3405f46)

https://github.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 12× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-24 15:04 UTCEG score recompute
  2. 2026-09-23 21:35 UTCEG score recompute
  3. 2026-09-23 17:54 UTCEPSS rescore
  4. 2026-09-22 19:17 UTCEG score recompute
  5. 2026-09-21 21:24 UTCEG score recompute
  6. 2026-09-21 20:58 UTCEG score recompute
  7. 2026-09-20 22:53 UTCEG score recompute
  8. 2026-09-20 20:16 UTCEPSS rescore
  9. 2026-09-19 16:18 UTCEG score recompute
  10. 2026-09-18 18:27 UTCEG score recompute
  11. 2026-09-18 17:29 UTCEG score recompute
  12. 2026-09-18 17:29 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-61550?
CVE-2026-61550 is a critical vulnerability published on September 18, 2026. 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…
When was CVE-2026-61550 disclosed?
CVE-2026-61550 was first published in the National Vulnerability Database on September 18, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-61550 actively exploited?
CVE-2026-61550 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 50.0% of all scored CVEs.
What is the CVSS score of CVE-2026-61550?
CVE-2026-61550 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-61550?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-61550, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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