Missing Authentication for Critical Function in Windows Server - CVE-2026-105588
Published: November 10, 2026
Vulnerability identifier: #VU164699
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-105588
CWE-ID: CWE-306
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to escalate privileges and change protected registry settings with the permissions of the Network Service account.
The vulnerability exists due to missing authentication for a critical function in Windows DHCP Server when processing a specially prepared configuration. A local privileged user can prepare a crafted configuration for the service to process to modify protected registry settings with Network Service permissions.
The configuration must be processed during a service restart or system reboot, and this lifecycle event is not reliably under the user's control.
Affected software
Windows Server
How to mitigate CVE-2026-105588
Install security update from vendor's website.
Windows Server - addressed in versions 2016 10.0.14393.9688, 2019 10.0.17763.9487, 2022 10.0.20348.5870, 2025 10.0.26100.33730, 2025 10.0.26100.33822