Critical 9.3Published Apr 7, 2026

CVE-2025-39666omd: Local privilege escalation when executing omd commands as root

Updated under an hour ago (Oct 26, 2026, 10:20 PM ET)

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It affects Checkmk GmbH Checkmk. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Checkmk GmbH Checkmk

Exploited in the last 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.

CVSS: 9.3 CRITICAL (v4.0, CNA)CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Weakness (CWE): CWE-426, CWE-829
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Checkmk
NVD analysis: Analyzed
Record last updated: Apr 7, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Checkmk GmbH Checkmk checkmk:checkmk (from the name)	2.2.0; from 2.3.0 before 2.3.0p46; from 2.4.0 before 2.4.0p25; from 2.5.0b1 before 2.5.0b3	CNA record
checkmk checkmk checkmk:checkmk	2.2.0; 2.2.0; 2.2.0; 2.2.0; 2.2.0; 2.2.0; 2.2.0; 2.2.0; and 134 more ranges	NVD

References

References

https://checkmk.com/werk/18891	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.