CVE-2026-83505CWE-367CWE-426

CVE-2026-83505

High · published October 13, 2026

CVSS v3.1
7.0
EPSS
0%
Percentile
12.6
In the wild
Unconfirmed
What it is

Time-of-check time-of-use (toctou) race condition in Windows Setup Files Cleanup 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
0.00226 · 12.6th percentile
Weaknesses
CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition; CWE-426 · Untrusted Search Path
Published
2026-10-13T23:19Z
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83505 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:34Z
    EPSS moved — → 0%
    epss
  • 13 OCT 19:00Z
    Windows Setup Files Cleanup Elevation of Privilege Vulnerability
    cvelistv5
  • 13 OCT 19:00Z
    Windows Setup Files Cleanup Elevation of Privilege Vulnerability
    cvelistv5