High severity · published Apr 7, 2026
CVE-2025-39666
omd: Local privilege escalation when executing omd commands as root
7.3
CVSS
0.1%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CH
Checkmk · Checkmk GmbH
2.2.0; 2.3.0 before 2.3.0p46; 2.4.0 before 2.4.0p25; 2.5.0b1 before 2.5.0b3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-39666
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-39666
Vendor Advisory
https://checkmk.com/werk/18891
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