CVE-2026-105009 Windows Server Update Service Elevation of Privilege Vulnerability
An authorized local attacker can elevate privileges due to incorrect default permissions in the Windows Server Update Service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-105009?
CVE-2026-105009 is a high-severity vulnerability in Microsoft Windows Server 2012, published on 13 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Incorrect default permissions in Windows Server Update Service allows an authorized attacker to elevate privileges locally.
Weakness: CWE-276
Which versions are affected by CVE-2026-105009?
It affects 5 products.
Products include Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025.
How do I fix CVE-2026-105009?
No fix has been published for CVE-2026-105009 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-105009 being exploited?
There is no known exploitation of CVE-2026-105009 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows Server 2012
- CVE-2025-59287 Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data
- CVE-2026-69595 Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
- CVE-2026-78445 Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
- CVE-2026-41089 Windows Netlogon Remote Code Execution Vulnerability
- CVE-2024-43639 Windows KDC Proxy Remote Code Execution Vulnerability
Sources
Also known as GHSA-455h-gjpq-v2gc.