CVE-2026-15576 Agent receiver accepts mTLS requests without a client certificate

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...

CVE-2026-15576

CVE-2026-15576 is an improper authentication vulnerability in the agent receiver of Checkmk versions prior to 2.5.0p10 . An unauthenticated remote attacker can bypass mutual TLS (mTLS) client certificate verification on relay endpoints by supplying a fixed placeholder identity in the request URL....

EUVD-2026-63903

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...

CVE-2026-24097 Authenticated Host Enumeration via Observable Response Discrepancy on Agent Register Existing Endpoint

Improper permission enforcement in Checkmk versions 2.4.0 before 2.4.0p23, 2.3.0 before 2.3.0p43, and 2.2.0 EOL allows authenticated users to enumerate existing hosts by observing different HTTP response codes in agent-receiver/registerexisting endpoint, which could lead to information disclosure...

PT-2026-25168

Improper permission enforcement in Checkmk versions 2.4.0 before 2.4.0p23, 2.3.0 before 2.3.0p43, and 2.2.0 EOL allows authenticated users to enumerate existing hosts by observing different HTTP response codes in agent-receiver/register existing endpoint, which could lead to information disclosur...

Linux Distros Unpatched Vulnerability : CVE-2022-48321

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Limited Server-Side Request Forgery SSRF in agent-receiver in Tribe29's Checkmk = 2.1.0p11 allows an attacker to communicate with local network restricted...

UBUNTU-CVE-2022-48321

Limited Server-Side Request Forgery SSRF in agent-receiver in Tribe29's Checkmk = 2.1.0p11 allows an attacker to communicate with local network restricted endpoints by use of the host registration API...

CVE-2022-48321 SSRF in agent-receiver API

Limited Server-Side Request Forgery SSRF in agent-receiver in Tribe29's Checkmk = 2.1.0p11 allows an attacker to communicate with local network restricted endpoints by use of the host registration API...