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.
References
History

Sat, 05 Sep 2026 22:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 04 Sep 2026 08:30:00 +0000

Type Values Removed Values Added
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.
Title Agent receiver certificate confusion allows authentication with a certificate issued for another endpoint
First Time appeared Checkmk
Checkmk checkmk
Weaknesses CWE-295
CPEs cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*
Vendors & Products Checkmk
Checkmk checkmk
References
Metrics cvssV4_0

{'score': 5.3, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Checkmk

Published: 2026-09-04T08:24:49.802Z

Updated: 2026-09-04T19:39:28.278Z

Reserved: 2026-07-16T08:40:57.255Z

Link: CVE-2026-15937

cve-icon Vulnrichment

Updated: 2026-09-04T19:39:23.166Z

cve-icon NVD

Status : Deferred

Published: 2026-09-04T09:17:10.410

Modified: 2026-09-08T14:10:24.113

Link: CVE-2026-15937

cve-icon Redhat

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