---
id: CVE-2026-111573
title: Privilege escalation via unprotected Windows agent data folder
summary: >-
  Incorrect permissions on the Checkmk Windows agent's data directory, caused by
  a race condition that discards the permission changes during service start, in
  Checkmk <2.5.0p18, <2.4.0p39, <2.3.0p52 and 2.2.0 (EOL) allow a local user to
  e…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:H/SI:H/SA:H'
cvssSource: cna
cwe:
  - CWE-277
vendor: Checkmk GmbH
product: Checkmk
affected:
  - Checkmk >= 2.5.0 < 2.5.0p18
  - Checkmk >= 2.4.0 < 2.4.0p39
  - Checkmk >= 2.3.0 < 2.3.0p52
  - Checkmk 2.2.0
published: '2026-11-06'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:27:41.790Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111573'
references:
  - url: 'https://checkmk.com/werk/19231'
tags:
  - cve.org
ingestedAt: '2026-11-06T16:57:43.265Z'
epss: 0.00131
epssPercentile: 0.02695
---

## Overview

Incorrect permissions on the Checkmk Windows agent's data directory, caused by a race condition that discards the permission changes during service start, in Checkmk <2.5.0p18, <2.4.0p39, <2.3.0p52 and 2.2.0 (EOL) allow a local user to execute arbitrary code as SYSTEM by placing scripts in the agent's plugins or local folders, and to read the agent controller's private key.

## Affected

- `Checkmk >= 2.5.0 < 2.5.0p18`
- `Checkmk >= 2.4.0 < 2.4.0p39`
- `Checkmk >= 2.3.0 < 2.3.0p52`
- `Checkmk 2.2.0`

## Remediation

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