CVE-2026-61550 Icinga 2 - Authentication Bypass

Icinga 2 2.8 to 2.14.9, 2.15.4, and 2.16.2 contains a broken authentication caused by lack of validation of sender in certificate update JSON-RPC message handling, letting unauthenticated network attackers impersonate trusted nodes and take control, exploit requires network access to TCP port 5665.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.67% chance of exploitation in 30 days
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