CVE-2026-83999CWE-59

CVE-2026-83999

High · published September 8, 2026

CVSS v3.1
7.0
EPSS
0%
Percentile
19.7
In the wild
Unconfirmed
What it is

Improper link resolution before file access ('link following') in Windows Resilient File System (ReFS) Deduplication Service allows an authorized attacker to elevate privileges locally.

The record
Technical detail
CVSS v3.1
7.0 · HIGH
Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00283 · 19.7th percentile
Weakness
CWE-59 · Improper Link Resolution Before File Access ('Link Following')
Published
2026-09-08T22:21Z
Affected products (7)
ProductVersionsFixed in
microsoft/windows_11_24h2< 10.0.26100.944510.0.26100.9445
microsoft/windows_11_24h2< 10.0.26100.944510.0.26100.9445
microsoft/windows_11_25h2< 10.0.26200.944510.0.26200.9445
microsoft/windows_11_25h2< 10.0.26200.944510.0.26200.9445
microsoft/windows_11_26h1< 10.0.28000.295410.0.28000.2954
microsoft/windows_11_26h1< 10.0.28000.295410.0.28000.2954
microsoft/windows_server_2025< 10.0.26100.3343810.0.26100.33438
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83999 · [email protected]
EPSS history
Timeline
  • 10 SEP 03:18Z
    EPSS moved — → 0%
    epss
  • 08 SEP 17:14Z
    Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability
    cvelistv5