CVE-2026-2859

Unauthenticated Host Enumeration via Observable Response Discrepancy on Deploy Agent Endpoint

CVSS 6.3 MEDIUMEPSS 0.2%CWE-204

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.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Affected products

Checkmk GmbH · Checkmk

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References

https://checkmk.com/werk/18994