What is CVE-2025-39666?

CVE-2025-39666 is a high-severity vulnerability in Checkmk, classified under Untrusted Search Path. CVSS score: 7.3/10. Published 2026-04-07.

How severe is CVE-2025-39666?

High severity. CVSS v3 base score is 7.3 out of 10.

Vulnerability in Checkmk

CVE-2025-39666

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.

EPSS: 0.001 (2.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

Affected products

Checkmk — versions 2.2.0, 2.3.0, 2.4.0
Checkmk Gmbh — versions 2.2.0, 2.3.0, 2.4.0

Weakness classification (CWE)

References

security@checkmk.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2025-39666?: CVE-2025-39666 is a high-severity vulnerability in Checkmk, classified under Untrusted Search Path. CVSS score: 7.3/10. Published 2026-04-07.
How severe is CVE-2025-39666?: High severity. CVSS v3 base score is 7.3 out of 10.