What is CVE-2026-24097?

CVE-2026-24097 is a medium-severity vulnerability in Checkmk, classified under Observable Response Discrepancy. CVSS score: 4.3/10. Published 2026-03-13.

How severe is CVE-2026-24097?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Checkmk

CVE-2026-24097

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.

EPSS: 0.002 (14.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Checkmk — versions 2.2.0, 2.3.0, 2.4.0
Checkmk Gmbh — versions 2.4.0, 2.3.0, 2.2.0

Weakness classification (CWE)

CWE-204 — Observable Response Discrepancy

References

security@checkmk.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-24097?: CVE-2026-24097 is a medium-severity vulnerability in Checkmk, classified under Observable Response Discrepancy. CVSS score: 4.3/10. Published 2026-03-13.
How severe is CVE-2026-24097?: Medium severity. CVSS v3 base score is 4.3 out of 10.