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 低于 2.5.0p10 版本中，由于端点未验证证书是否由其自身的根证书签发，导致证书验证不当。这使得共享相同 UUID 的 relay 和 push agent 可以互相重用对方的 mTLS 证书，从而在任意方向上向 agent 接收端点进行身份认证。
Possible ATT&CK Techniques 3 AI
T1557.002 · ARP Cache Poisoning T1557 · Adversary-in-the-Middle T1557.001 · Name Resolution Poisoning and SMB RelayAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Checkmk GmbH | Checkmk | 2.5.0 ~ 2.5.0p10 | - |
|
II. Public POCs for CVE-2026-15937
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Pages for CVE-2026-15937 (1)
-
🔗 Werk #19735: Fixed agent receiver certificate confusion vendor-advisory
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V. Comments for CVE-2026-15937
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