CVE-2026-117611 Checkmk - Improper Certificate Validation

Checkmk < 2.5.0p18, < 2.4.0p39, < 2.3.0p52, and 2.2.0 contain an improper certificate validation caused by inclusion of a root CA trusting eMudhra intermediate certificates with public private keys, letting attackers bypass TLS validation, exploit requires use of affected certificate bundles.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.24% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Improper Certificate Validation
Impact
Man In The Middle
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
29 October 2026
Updated
31 October 2026
Weakness
CWE-295

Vendor fix

Update to the latest version beyond 2.5.0p18.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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