CVE-2026-62775

EUVD-2026-56659
Incorrect authorization in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to disclose information locally.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.5 MEDIUM
LOCAL
LOW
LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 25.8%
Affected Products (NVD)
VendorProductVersion
microsoftwindows_11_26h1
𝑥
< 10.0.28000.2704
𝑥
= Vulnerable software versions
Windows Releases
Platform
Version
Windows 11
26H1 (arm64, x64)
KB5121000
Common Weakness Enumeration
References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62775