CVE-2026-66804
High
Description
Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Microsoft Windows
PublishedAug 11, 2026
First seenAug 11, 2026
Weakness typeCWE-284Improper access control
How to fix
Update
- microsoft windows_10_22h210.0.19045.7663 or later
- microsoft windows_11_24h210.0.26100.9106 or later
- microsoft windows_11_25h210.0.26200.9106 or later
- microsoft windows_11_26h110.0.28000.2704 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft windows_10_22h2 | v < 10.0.19045.7663 | 10.0.19045.7663 |
| microsoft windows_11_24h2 | v < 10.0.26100.9106 | 10.0.26100.9106 |
| microsoft windows_11_25h2 | v < 10.0.26200.9106 | 10.0.26200.9106 |
| microsoft windows_11_26h1 | v < 10.0.28000.2704 | 10.0.28000.2704 |
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