CVE-2026-66804CWE-284broken-access-control

CVE-2026-66804

High · published August 11, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
21.3
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00298 · 21.3th percentile
Weakness
CWE-284 · Improper Access Control
Published
2026-08-11T21:19Z
Affected products (9)
ProductVersionsFixed in
microsoft/windows_10_22h2< 10.0.19045.766310.0.19045.7663
microsoft/windows_10_22h2< 10.0.19045.766310.0.19045.7663
microsoft/windows_10_22h2< 10.0.19045.766310.0.19045.7663
microsoft/windows_11_24h2< 10.0.26100.910610.0.26100.9106
microsoft/windows_11_24h2< 10.0.26100.910610.0.26100.9106
microsoft/windows_11_25h2< 10.0.26200.910610.0.26200.9106
microsoft/windows_11_25h2< 10.0.26200.910610.0.26200.9106
microsoft/windows_11_26h1< 10.0.28000.270410.0.28000.2704
microsoft/windows_11_26h1< 10.0.28000.270410.0.28000.2704
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66804 · [email protected]
EPSS history
Timeline
  • 11 AUG 17:05Z
    Microsoft Windows Cross Device Service Elevation of Privilege Vulnerability
    cvelistv5