CVE-2026-83657 Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally

Description

Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.

Affected products and versions

Product	Affected versions	Fixed in
Windows 10 Version 1809 10.0	10.0.17763.0 → < 10.0.17763.9376	10.0.17763.9376
Windows Server 2019 10.0	10.0.17763.0 → < 10.0.17763.9376	10.0.17763.9376
Windows Server 2019 (Server Core installation) 10.0	10.0.17763.0 → < 10.0.17763.9376	10.0.17763.9376

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