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Vulnerabilities CVE-2026-15576

CVE-2026-15576

Medium
Open
TLP:CLEAR

Agent receiver accepts mTLS requests without a client certificate

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Description

Improper authentication in the agent receiver of Checkmk <2.5.0p10 allows an unauthenticated remote attacker to bypass mutual TLS client certificate verification of relay endpoints by supplying a fixed placeholder identity in the request URL, resulting in limited impact on integrity and availability. Only the Cloud, Ultimate and Ultimate MT editions are affected, as other editions do not expose relay endpoints.

Details

CVSS Score
6.9
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Confidence
90%
Published
Aug 21, 2026
Last Modified
Aug 21, 2026
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