CVE-2026-83586CWE-1390

CVE-2026-83586

High · published October 13, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
19.8
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00284 · 19.8th percentile
Weakness
CWE-1390 · Weak Authentication
Published
2026-10-13T23:20Z
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83586 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:34Z
    EPSS moved — → 0%
    epss
  • 13 OCT 18:59Z
    Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability
    cvelistv5
  • 13 OCT 18:59Z
    Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability
    cvelistv5