---
id: CVE-2026-62879
title: >-
  Missing authentication for critical function in Windows SmartScreen allows an
  authorized attacker to perform tampering locally.
summary: >-
  Missing authentication for critical function in Windows SmartScreen allows an
  authorized attacker to perform tampering locally.
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-306
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T22:17:38.730'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-62879'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62879'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-13T19:43:28.948Z'
vendor: Microsoft
product: Windows 10 Version 1809
affected:
  - windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.9376
  - windows_10_version_21h2 >= 10.0.19044.0 < 10.0.19044.7807
  - windows_10_version_22h2 >= 10.0.19045.0 < 10.0.19044.7807
  - windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7652
  - windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7652
  - windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.9711
  - windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.9711
  - windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.3231
  - windows_11_version_26h2 >= 10.0.26300.0 < 10.0.26300.9711
  - windows_server_2019 >= 10.0.17763.0 < 10.0.17763.9376
  - >-
    windows_server_2019_server_core_installation >= 10.0.17763.0 <
    10.0.17763.9376
  - windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5761
  - windows_server_2025 >= 10.0.26100.0 < 10.0.26100.33650
  - >-
    windows_server_2025_server_core_installation >= 10.0.26100.0 <
    10.0.26100.33650
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-13T21:10:30.072472Z'
epss: 0.00343
epssPercentile: 0.27687
---

## Overview

Missing authentication for critical function in Windows SmartScreen allows an authorized attacker to perform tampering locally.

## Remediation

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