CVE-2026-15937
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductCheckmk
PublishedSep 4, 2026
First seenSep 4, 2026
Weakness typeCWE-295CWE-295
How to fix
Update
- Checkmk GmbH Checkmk2.5.0p10 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Checkmk GmbH Checkmk | 2.5.0 ≤ v < 2.5.0p10 | 2.5.0p10 |
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