CVE-2026-66804: high-severity vulnerability in Microsoft Windows 10 Version 22H2
Microsoft Windows Cross Device Service Elevation of Privilege Vulnerability
Published · Updated
43Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 7.8epss 0.3%
from disclosure to weapon0 days
Published on NVDAug 11
1st PoCJul 19
exploitation probability
0.3%top 79% of all CVEs
observed exploitation
nono source reports it
4 public exploit(s)
Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.
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
Affected products
Microsoft · Windows 10 Version 22H2Microsoft · Windows 11 Version 24H2Microsoft · Windows 11 Version 25H2Microsoft · Windows 11 version 26H1public PoCs found — 4
githubgithub.com/Rat5ak/CVE-2026-66804-CrossDevice-Service-EoP★ 24githubgithub.com/DavidCarliez/CVE-2026-66804-CrossDevice-LPE★ 14githubgithub.com/ZeroDayVPN/CVE-2026-66804-CrossDevice-Service-EoP★ 2githubgithub.com/CypherHippie/CVE-2026-66804★ 1⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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