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CVE-2026-15937— Agent receiver certificate confusion allows authentication with a certificate issued for another endpoint

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之前版本存在加密问题漏洞，该漏洞源于证书验证不当，端点未验证证书是否由自己的根证书颁发，导致共享同一UUID的中继和推送代理可重用彼此的mTLS证书向代理接收端点进行身份验证。

CVSS 5.3 · Medium EPSS 0.23% · P14

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-2026-15937

Vulnerability Information
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Vulnerability Title
Agent receiver certificate confusion allows authentication with a certificate issued for another endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Improper certificate validation in Checkmk <2.5.0p10 allows a relay and a push agent that share the same UUID to reuse each other's mTLS certificate to authenticate against agent receiver endpoints in either direction, because the endpoints do not verify that the certificate was issued by their own root certificate.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Checkmk 加密问题漏洞
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之前版本存在加密问题漏洞，该漏洞源于证书验证不当，端点未验证证书是否由自己的根证书颁发，导致共享同一UUID的中继和推送代理可重用彼此的mTLS证书向代理接收端点进行身份验证。
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-2026-15937

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III. Intelligence Information for CVE-2026-15937

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Vendor Pages for CVE-2026-15937 (1)

IV. Related Vulnerabilities

Same product: Checkmk
Same vendor: Checkmk GmbH
Same weakness: CWE-295