CVE-2026-83657 Windows Modern Device Management (MDM) Tampering Vulnerability
Weak authentication in Windows MDM allows local attackers to tamper with device management settings, requiring a security patch.
- 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-2026-83657?
CVE-2026-83657 is a medium-severity authentication bypass vulnerability in Microsoft Windows 10 1809, 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
Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
Weakness: CWE-1390
Which versions are affected by CVE-2026-83657?
It affects 2 products.
Products include Microsoft Windows 10 1809, Microsoft Windows Server 2019.
How do I fix CVE-2026-83657?
No fix has been published for CVE-2026-83657 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-83657 being exploited?
There is no known exploitation of CVE-2026-83657 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 1809
- CVE-2024-29988 Microsoft SmartScreen Prompt Security Feature Bypass
- CVE-2024-21412 Microsoft Windows Internet Shortcut Files Security Feature Bypass
- CVE-2025-62221 Microsoft Windows Use After Free
- CVE-2025-30400 Microsoft Windows DWM Core Library Use-After-Free
- CVE-2024-21338 Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control
Sources
Also known as GHSA-xpx6-rc5v-vgmh.