Weak Authentication in Microsoft Windows and Windows Server - CVE-2026-83657
Published: October 14, 2026
Vulnerability identifier: #VU154801
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-83657
CWE-ID: CWE-1390
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to perform tampering locally.
The vulnerability exists due to weak authentication in Windows Modern Device Management (MDM) when authenticating users locally. A local user can exploit weak authentication to perform tampering locally.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-83657
Install security update from vendor's website.
Microsoft Windows - update to 10 1809 10.0.17763.9376
Windows Server - update to 2019 10.0.17763.9376
Windows Server - update to 2019 10.0.17763.9376