CVE-2025-39666: Checkmk

High severity, CVSS 7.3. EPSS: 0.1% chance of exploitation in the next 30 days.

Local privilege escalation in Checkmk 2.2.0 (EOL), Checkmk 2.3.0 before 2.3.0p46, Checkmk 2.4.0 before 2.4.0p25, and Checkmk 2.5.0 (beta) before 2.5.0b3 allows a site user to escalate their privileges to root, by manipulating files in the site context that are processed when the `omd` administrative command is run by root.

Affected products

• Checkmk Checkmk: version 2.2.0 only; version 2.3.0 only; version 2.4.0 only; version 2.5.0 only

Published 2026-04-07. Last modified 2026-10-05.