CVE-2026-105009: Windows Server Update Service Elevation of Privilege Vulnerability
Incorrect default permissions in Windows Server Update Service allows an authorized attacker to elevate privileges locally.
Other sources
Windows Server Update Service Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9376Patch KB5126651 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.2.9200.26434Patch KB5126835 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.3.9600.23470Patch KB5126836 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.9612Patch KB5126868
Event History
Frequently Asked Questions
Which systems should be prioritized for review?
The affected software list includes Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025, as well as Microsoft Windows Server Update Service.
What level of access does an attacker need?
Exploitation requires an authorized attacker with local access and low privileges. The attack complexity is rated high, and user interaction is required.
Is this related to nondefault permission settings?
The issue is attributed to incorrect default permissions in Windows Server Update Service. The provided information does not specify whether changed permissions prevent exploitation or how to identify affected permission settings.