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CVE-2026-15937

Agent receiver certificate confusion allows authentication with a certificate issued for another endpoint

MEDIUM
5.3
CVSS Score
Published: September 4, 2026 at 08:24 AM UTC
Updated: September 8, 2026 at 02:21 PM UTC
1 product affected across 1 vendorCheckmk

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Checkmk· Checkmk
95%
2.5.0 ≤ v < 2.5.0p102.5.0
Affected range stops below 2.5.0p10, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://checkmk.com/werk/19735

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMCheckmk
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-295

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