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CVE-2026-83586 Details

Weak authentication in Windows Resilient File System (ReFS) Deduplication Service allows an authorized attacker to elevate privileges locally.

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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URL	Source(s)	Tag(s)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83586	[email protected]	Vendor AdvisoryPatch

CWE-ID	CWE Name	Source
CWE-1390	Weak Authentication	[email protected]

Product	Versions
microsoft windows 11 23h2	< 10.0.22631.7652
CPE cpe:2.3:o:microsoft:windows_11_23h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_23h2:::::::x64:* Remediation No remediation found in references.
microsoft windows 11 24h2	< 10.0.26100.9711
CPE cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_24h2:::::::x64:* Remediation No remediation found in references.
microsoft windows 11 25h2	< 10.0.26200.9711
CPE cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_25h2:::::::x64:* Remediation No remediation found in references.
microsoft windows 11 26h1	< 10.0.28000.3231
CPE cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64:* cpe:2.3:o:microsoft:windows_11_26h1:::::::x64:* Remediation No remediation found in references.
microsoft windows 11 26h2	< 10.0.26300.9711
CPE cpe:2.3:o:microsoft:windows_11_26h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_26h2:::::::x64:* Remediation No remediation found in references.
microsoft windows server 2025	< 10.0.26100.33650
CPE cpe:2.3:o:microsoft:windows_server_2025:::::::x64:* Remediation No remediation found in references.

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