CVE-2026-81964 Windows Update Orchestrator Service Security Feature Bypass Vulnerability
An authorized local attacker can bypass security features in the Windows Update Orchestrator Service due to hard-coded credentials.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-81964?
CVE-2026-81964 is a medium-severity vulnerability in Microsoft Windows 10 21h2, published on 13 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Use of hard-coded credentials in Windows Update Orchestrator Service allows an authorized attacker to bypass a security feature locally.
Weakness: CWE-798
Which versions are affected by CVE-2026-81964?
It affects 9 products.
Products include Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1 and 3 more.
How do I fix CVE-2026-81964?
No fix has been published for CVE-2026-81964 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-81964 being exploited?
There is no known exploitation of CVE-2026-81964 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 21h2
- CVE-2025-21333 Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow
- CVE-2025-21334 Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free
- CVE-2025-21335 Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free
- CVE-2026-42904 Windows TCP/IP Elevation of Privilege Vulnerability
- CVE-2026-105733 Windows Hyper-V Remote Code Execution Vulnerability
Sources
Also known as GHSA-f9hw-m56h-5qgp.