9.8

CVE-2026-61550: icinga icinga2 Missing Authorization

CVSS: 9.8v3.1CriticalAwaiting analysis
AliasesUBUNTU-CVE-2026-61550DEBIAN-CVE-2026-61550
Published 18-09-2026Last modified 21-09-2026
Open JSON

Vulnerability summary

CVE-2026-61550 is a critical (CVSS 9.8) Missing Authorization vulnerability in icinga icinga2. EPSS estimates a 0.67% chance of exploitation in the next 30 days, higher than 51.3% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.67%
0%100%
Low · +0.30 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 18-09-2026
    PublishedVulnerability first disclosed.
  2. 21-09-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.67%

Chance of exploitation in the next 30 days

Percentile

51%

Versus all other CVEs

30-day change

+0.30 pp

From 0.37% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.67%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • icinga2All versions (No fix recorded) | < 2.14.6-1+deb13u1 | < 2.16.2-1
Icinga1 product
  • icinga2≥ 2.8, < 2.14.9 | ≥ 2.15.0, < 2.15.4 | ≥ 2.16.0, < 2.16.2
Ubuntu1 product
  • icinga2All versions (No fix recorded)

3 vendors · 3 products

References

14 links
Show all 14 references