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

Quick assessment

Affected
Checkmk GmbH Checkmk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Checkmk是Checkmk公司的一个 IT 监控平台。 Checkmk 2.5.0p10之前版本存在授权问题漏洞，该漏洞源于代理接收器身份验证不当，可能允许未经身份验证的远程攻击者通过在请求URL中提供固定占位符身份绕过中继端点的相互TLS客户端证书验证，对完整性和可用性造成有限影响。

CVSS 6.9 · Medium EPSS 0.45% · P38

Affected Version Matrix 1

VendorProduct Version RangeStatus
Checkmk GmbH Checkmk 2.5.0< 2.5.0p10 affected
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I. Basic Information for CVE-2026-15576

Vulnerability Information
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Vulnerability Title
Agent receiver accepts mTLS requests without a client certificate
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Checkmk 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Checkmk是Checkmk公司的一个 IT 监控平台。 Checkmk 2.5.0p10之前版本存在授权问题漏洞，该漏洞源于代理接收器身份验证不当，可能允许未经身份验证的远程攻击者通过在请求URL中提供固定占位符身份绕过中继端点的相互TLS客户端证书验证，对完整性和可用性造成有限影响。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Checkmk GmbH Checkmk 2.5.0 ~ 2.5.0p10 -

II. Public POCs for CVE-2026-15576

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III. Intelligence Information for CVE-2026-15576

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Vendor Advisories for CVE-2026-15576 (1)

IV. Related Vulnerabilities

Same product: Checkmk
Same vendor: Checkmk GmbH
Same weakness: CWE-306

V. Comments for CVE-2026-15576

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