---
id: CVE-2025-39666
title: >-
  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 th…
summary: >-
  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 th…
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-426
  - CWE-829
vendor: checkmk
product: checkmk
affected:
  - checkmk = 2.2.0
  - checkmk = 2.3.0
  - checkmk = 2.4.0
  - checkmk = 2.5.0
published: '2026-04-07'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T17:10:00.237'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-39666'
references:
  - url: 'https://checkmk.com/werk/18891'
    label: security@checkmk.com
tags:
  - nvd
epss: 0.00121
epssPercentile: 0.01694
ingestedAt: '2026-10-05T17:27:45.027Z'
---

## Overview

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

- `checkmk = 2.2.0`
- `checkmk = 2.3.0`
- `checkmk = 2.4.0`
- `checkmk = 2.5.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.