CVE-2025-58121: Insufficient permission validation on multiple REST API endpoints

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-11-18 · updated 2026-10-19
Weakness: CWE-280

Description

Insufficient permission validation on multiple REST API endpoints in Checkmk 2.2.0, 2.3.0, and 2.4.0 before version 2.4.0p16 allows low-privileged users to perform unauthorized actions or obtain sensitive information

Affected products

Checkmk GmbH Checkmk: from 2.2.0 before 2.4.0; 2.4.0, 2.4.0-b1, 2.4.0-b2, 2.4.0-b3, 2.4.0-b4, 2.4.0-b5 (+16) — fixed in 2.4.0

How to fix

Upgrade to a fixed version: Checkmk GmbH Checkmk 2.4.0. Check the vendor advisory for mitigations.

References

https://checkmk.com/werk/18983

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