Vulnerability 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.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-15576?
CVE-2026-15576 is a documented vulnerability. 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 fixe...
How severe is CVE-2026-15576?
CVSS scoring is not yet available for CVE-2026-15576. Check NVD for updates.
Is there a patch for CVE-2026-15576?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.