CVE-2026-2859

MediumCVSS 4.3/10Last modified Jun 17, 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 unauthenticated users to enumerate existing hosts by observing different HTTP response codes in deploy_agent endpoint, which could lead to information disclosure.

Metrics

CVSS 3.1 4.3/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Weakness enumeration

CWE-204

Affected software

VendorProductVersions
Checkmk GmbHCheckmk>= 2.4.0, < 2.4.0p23; >= 2.3.0, < 2.3.0p43; 2.2.0

References

Timeline

Published
Mar 13, 2026
Last modified
Jun 17, 2026
NVD status
Analyzed

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CVE-2026-2859: Medium severity, CVSS 4.3 | Vulnix