EUVD-2026-43786
GHSA-97vr-gvp2-wh8w
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local vector and low privilege confirmed by local-only File Explorer access; high confidentiality impact but no integrity or availability effect applies.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Exposure of sensitive information to an unauthorized actor in Windows File Explorer allows an authorized attacker to disclose information locally.
AnalysisAI
Windows File Explorer on affected Microsoft Windows 10, Windows 11, and Windows Server platforms exposes sensitive information to locally authenticated low-privilege users without authorization. The CWE-200 root cause indicates inadequate access restrictions within the File Explorer shell component, enabling a user to read data beyond their authorization boundary. No public exploit exists and SSVC confirms no observed exploitation activity, but the broad Windows deployment footprint and high confidentiality impact (C:H) make this relevant for shared-access environments, terminal servers, and organizations with insider-threat concerns.
Technical ContextAI
CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) describes a failure to properly restrict access to data that should be protected by access controls or filtering. Windows File Explorer is the default shell and file management interface in Microsoft Windows, deeply integrated with the OS and accessible to all interactive users. The CVSS vector (AV:L/AC:L/PR:L/UI:N/S:U) confirms this is a local, low-complexity attack requiring only standard user-level authentication, consistent with File Explorer inadvertently surfacing restricted file metadata, cached credentials, path information, or other sensitive OS data to users who lack authorization. CPE strings confirm affected products span cpe:2.3:a:microsoft:windows_10_version_1607 through cpe:2.3:a:microsoft:windows_server_2019, covering a decade-wide range of Windows releases. The unchanged scope (S:U) indicates the impact is contained to the vulnerable system rather than propagating to adjacent systems.
RemediationAI
Apply the Microsoft-released security update for each affected Windows version via Windows Update, WSUS, or Microsoft Update Catalog. Specific fixed builds confirmed by EUVD data are: Windows 10 1607 and Server 2016 - build 10.0.14393.9339 or later; Windows 10 1809 and Server 2019 - build 10.0.17763.9020 or later; Windows 10 21H2 - build 10.0.19044.7548 or later; Windows 10 22H2 - build 10.0.19045.7548 or later; Windows 11 24H2 - build 10.0.26100.8875 or later; Windows Server 2025 - build 10.0.26100.33158 or later; Windows 11 25H2 - build 10.0.26200.8875 or later; Windows 11 26H1 - build 10.0.28000.2269 or later; Windows Server 2022 - build 10.0.20348.5386 or later. The MSRC patch advisory is at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41087. Where immediate patching is not feasible, reduce exposure by restricting interactive logon rights to trusted users only via Group Policy (User Rights Assignment → 'Allow log on locally' and 'Allow log on through Remote Desktop Services') - note this may disrupt operations in multi-user or RDS environments. No vendor-documented workarounds short of patching have been confirmed in available public sources.
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Same weakness CWE-200 – Information Exposure
View allSame technique Information Disclosure
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External POC / Exploit Code
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