Search/CVE-2026-66804
● CVE — High

CVE-2026-66804

VendormicrosoftProductwindows 10 22h2, windows 11 24h2, windows 11 25h2, windows 11 26h1DiscoveredAug 11, 2026UpdatedAug 14, 2026

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

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CVSS v3.1
7.8 HIGH
EPSS
0.30%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
1
sources referencing this CVE
Related IOCs
0
seen in the same coverage
Intelligence Reports5
5 intelligence reports available

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EPSS Trend
Aug 16, 2026 → Sep 25, 2026
▼ 3.12pp
3.42% → 0.30% over 3 tracked changes
CVSS v3.1 Detail
Attack VectorLOCAL
Attack ComplexityLOW
Privileges RequiredLOW
User InteractionNONE
ScopeUNCHANGED
ConfidentialityHIGH
IntegrityHIGH
AvailabilityHIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Connections
6 relationships
Timeline
disclosure → media coverage
Aug 11, 2026
Disclosure — published as a CVE record. · last revised by NVD Aug 14, 2026
Aug 11, 2026
advisories.ncsc.nl reports: NCSC-2026-0284 [1.00] [M/H] Kwetsbaarheden verholpen in Microsoft Windows
Public PoC (4)
github.com/ZeroDayVPN/CVE-2026-66804-CrossDevice-Service-EoPgithub.com/DavidCarliez/CVE-2026-66804-CrossDevice-LPEgithub.com/CypherHippie/CVE-2026-66804github.com/Rat5ak/CVE-2026-66804-CrossDevice-Service-EoP
Unverified third-party code — review before executing.