---
id: CVE-2026-83504
title: >-
  Time-of-check time-of-use (toctou) race condition in Windows SmartScreen
  allows an authorized attacker to disclose information locally.
summary: >-
  Time-of-check time-of-use (toctou) race condition in Windows SmartScreen
  allows an authorized attacker to disclose information locally.
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-367
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T21:18:22.850'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83504'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83504'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-13T19:43:29.058Z'
vendor: Microsoft
product: Windows 11 version 23H2
affected:
  - windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7582
  - windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7582
  - windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.9445
  - windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.9445
  - windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2954
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-13T20:41:47.893597Z'
epss: 0.00278
epssPercentile: 0.20065
---

## Overview

Time-of-check time-of-use (toctou) race condition in Windows SmartScreen allows an authorized attacker to disclose information locally.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.