CVE-2026-81969: Windows Server Update Service Elevation of Privilege Vulnerability
Insufficient granularity of access control 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 6.3.9600.23470Patch KB5126836 - 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 10.0.14393.9612Patch KB5126868 - 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
Event History
Frequently Asked Questions
Who can exploit this vulnerability?
An attacker must already be authorized on the affected system and able to execute code locally. The supplied CVSS vector indicates no user interaction is required.
Is this remotely exploitable?
The available information identifies the attack vector as local. It does not describe a network-based exploitation path.
What is the likely impact of successful exploitation?
A successful attacker can elevate privileges locally. The CVSS metrics indicate high impact to confidentiality, integrity, and availability.
Which systems should be prioritized for review?
Review systems running the listed Windows 10 or Windows Server versions where Windows Server Update Service is present. The provided data does not identify affected update levels, configurations, or fixed versions.