Description
Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 – < 10.0.19045.7663 | 10.0.19045.7663 |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 – < 10.0.26100.9168 | 10.0.26100.9168 |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 – < 10.0.26200.9168 | 10.0.26200.9168 |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 – < 10.0.28000.2704 | 10.0.28000.2704 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 3 repositories
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Rat5ak/CVE-2026-66804-CrossDevice-Service-EoP ★ 26 · Aug 13, 2026
CVE-2026-66804 Windows Cross Device virtual camera EoP - Standard user to SYSTEM
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DavidCarliez/CVE-2026-66804-CrossDevice-LPE ★ 17 · Jul 23, 2026
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CypherHippie/CVE-2026-66804 ★ 1 · Jul 25, 2026
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 3
- MSRC-CVE-2026-66804 Microsoft Windows Cross Device Service Elevation of Privilege Vulnerability Microsoft Security Response Center · Oct 7, 2026
- WID-SEC-2026-2756 Microsoft Windows Produkte: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 30, 2026
- NCSC-2026-0284 Kwetsbaarheden verholpen in Microsoft Windows NCSC-NL (Netherlands) · Aug 11, 2026
References
- Microsoft Windows Cross Device Service Elevation of Privilege Vulnerability vendor-advisory patch