CVE-2026-66804

Microsoft Windows Cross Device Service Elevation of Privilege Vulnerability

State: Published
Severity: 7.8 High
Published: Aug 11, 2026
Updated: Oct 21, 2026
Reserved: Jul 27, 2026

Description

Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-284 Improper Access Control

Affected Products

Product	Versions
Windows 10 Version 22H2Microsoft	10.0.19045.0 to before 10.0.19045.7663Affected
Windows 11 Version 24H2Microsoft	10.0.26100.0 to before 10.0.26100.9168Affected
Windows 11 Version 25H2Microsoft	10.0.26200.0 to before 10.0.26200.9168Affected
Windows 11 version 26H1Microsoft	10.0.28000.0 to before 10.0.28000.2704Affected

References

Microsoft Windows Cross Device Service Elevation of Privilege Vulnerabilityvendor-advisorypatch

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