CVE-2026-83657

Windows Modern Device Management (MDM) Tampering Vulnerability

State: Published
Severity: 5.5 Medium
Published: Oct 13, 2026
Updated: Oct 31, 2026
Reserved: Aug 31, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-1390 Weak Authentication

Affected Products

Product	Versions
Windows 10 Version 1809Microsoft	10.0.17763.0 to before 10.0.17763.9376Affected
Windows Server 2019Microsoft	10.0.17763.0 to before 10.0.17763.9376Affected
Windows Server 2019 (Server Core installation)Microsoft	10.0.17763.0 to before 10.0.17763.9376Affected

References

Windows Modern Device Management (MDM) Tampering Vulnerabilityvendor-advisorypatch

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