EUVD-2026-44263
GHSA-q3w6-43fx-586m
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
AV:L because exploitation requires local session; PR:L because interacting with File Explorer requires at minimum a standard Windows user login, not unauthenticated access.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Use of uninitialized resource in Windows File Explorer allows an unauthorized attacker to disclose information locally.
AnalysisAI
Information disclosure in Windows File Explorer exposes sensitive memory contents to local attackers due to CWE-908 use of an uninitialized resource. Triggered when a local user interacts with File Explorer, the flaw allows memory contents - potentially including sensitive data from other processes or the OS - to be read without elevated privileges. No public exploit code has been identified and CISA has not listed this in KEV, but the breadth of affected platforms (Windows 10 through 11 and Windows Server 2012 through 2025) makes patching broadly applicable.
Technical ContextAI
CWE-908 (Use of Uninitialized Resource) indicates that Windows File Explorer reads or operates on a memory buffer or resource that has not been properly initialized before use, allowing that region's prior contents - which may include heap residue or stack data from other components - to be surfaced to the calling context. Affected CPEs span the Microsoft Windows client and server product lines: cpe:2.3:a:microsoft:windows_10_version_1607 through cpe:2.3:a:microsoft:windows_11_version_26h1, and server editions from Windows Server 2012 through Windows Server 2025, including Server Core installations. The local attack vector (AV:L) and required user interaction (UI:R) indicate the vulnerability manifests during normal File Explorer usage, such as browsing directories or rendering shell metadata, rather than requiring a specially crafted network packet.
RemediationAI
Apply the Microsoft security update addressing CVE-2026-57084, available through Windows Update and WSUS. Exact patched build numbers per platform (from EUVD data): Windows 10 1607 and Server 2016 - 10.0.14393.9339; Windows 10 1809 and Server 2019 - 10.0.17763.9020; Windows 10 21H2 - 10.0.19044.7548; Windows 10 22H2 - 10.0.19045.7548; Windows 11 24H2 and 25H2 - 10.0.26100.8875; Windows 11 26H1 - 10.0.28000.2525; Windows Server 2012 - 6.2.9200.26226; Windows Server 2012 R2 - 6.3.9600.23291; Windows Server 2022 - 10.0.20348.5386; Windows Server 2025 - 10.0.26100.33158. See https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57084 for full guidance. For systems where patching is temporarily deferred, restrict local interactive access to File Explorer on sensitive servers by limiting RDP and console session permissions to administrative accounts only - note this trade-off reduces operational convenience for standard users.
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External POC / Exploit Code
Leaving vuln.today