CVE-2026-83999

Published Sep 8, 2026

Last updated 16 hours ago

Overview

Description
Improper link resolution before file access ('link following') in Windows Resilient File System (ReFS) Deduplication Service allows an authorized attacker to elevate privileges locally.
Source
secure@microsoft.com
NVD status
Analyzed
Products
windows_11_24h2, windows_11_25h2, windows_11_26h1, windows_server_2025

Risk scores

CVSS 3.1

Type
Primary
Base score
7
Impact score
5.9
Exploitability score
1
Vector string
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity
HIGH

Weaknesses

secure@microsoft.com
CWE-59

Social media

Hype score
Not currently trending

Configurations

References

Sources include official advisories and independent security research.