CVE-2026-83586

VendormicrosoftProductwindows 11 24h2, windows 11 25h2, windows 11 26h1, windows server 2025, windows 11 23h2, windows 11 26h2DiscoveredOct 13, 2026UpdatedOct 29, 2026

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

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CVSS v3.1

7.8 HIGH

EPSS

0.32%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

Related IOCs

seen in the same coverage

CVSS v3.1 Detail

Attack VectorLOCAL

Attack ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

ScopeUNCHANGED

ConfidentialityHIGH

IntegrityHIGH

AvailabilityHIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Connections

7 relationships

CWE-1390

source

Timeline

disclosure → media coverage

Oct 13, 2026

Disclosure — published as a CVE record. · last revised by NVD Oct 29, 2026