Permissions Flaw in Checkmk Windows Agent by Checkmk
CVE-2026-111573

6.3MEDIUM

Key Information:

Vendor

Checkmk Gmbh

Status
Checkmk
Vendor
CVE Published:
6 November 2026

What is CVE-2026-111573?

The Checkmk Windows agent has a permissions flaw in its data directory due to a race condition. This issue prevents proper permission application during service startup, potentially allowing local users to execute arbitrary code with SYSTEM privileges by placing malicious scripts in the agent's directories. Additionally, this vulnerability exposes the agent controller's private key, further compromising system security.

Affected Version(s)

Checkmk 2.5.0 < 2.5.0p18

Checkmk 2.4.0 < 2.4.0p39

Checkmk 2.3.0 < 2.3.0p52

References

https://checkmk.com/werk/19231
vendor-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Anonymous researcher
Michal 'mdronski.pl' Dronski
.