---
id: CVE-2026-50406
title: Windows Backup Engine Elevation of Privilege Vulnerability
summary: >-
  Use after free in Windows Backup Engine allows an authorized attacker to
  elevate privileges locally.
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-416
vendor: Microsoft
product: Windows 10 Version 21H2
affected:
  - windows_10_version_21h2 >= 10.0.19044.0 < 10.0.19044.7548
  - windows_10_version_22h2 >= 10.0.19045.0 < 10.0.19045.7548
  - windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.8875
  - windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.8875
  - windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2525
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-07-22T00:00:00+00:00'
published: '2026-07-14'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T18:22:59.553Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-50406'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50406'
    label: Windows Backup Engine Elevation of Privilege Vulnerability
tags:
  - cve.org
epss: 0.00279
epssPercentile: 0.18057
ingestedAt: '2026-09-08T17:06:31.916Z'
---

## Overview

Use after free in Windows Backup Engine allows an authorized attacker to elevate privileges locally.

## Affected

- `windows_10_version_21h2 >= 10.0.19044.0 < 10.0.19044.7548`
- `windows_10_version_22h2 >= 10.0.19045.0 < 10.0.19045.7548`
- `windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.8875`
- `windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.8875`
- `windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2525`

## Remediation

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