CVE-2026-24097

Authenticated Host Enumeration via Observable Response Discrepancy on Agent Register Existing Endpoint

State: Published
Severity: 5.3 Medium
Published: Mar 13, 2026
Updated: Mar 13, 2026
Reserved: Jan 21, 2026

Description

Improper permission enforcement in Checkmk versions 2.4.0 before 2.4.0p23, 2.3.0 before 2.3.0p43, and 2.2.0 (EOL) allows authenticated users to enumerate existing hosts by observing different HTTP response codes in agent-receiver/register_existing endpoint, which could lead to information disclosure.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N	Checkmk

Weaknesses

CWE-204 Observable Response Discrepancy

Affected Products

Product	Versions
CheckmkCheckmk GmbH	2.4.0 to before 2.4.0p23Affected 2.3.0 to before 2.3.0p43Affected 2.2.0Affected

References

https://checkmk.com/werk/18993

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