---
id: CVE-2026-20825
title: >-
  Improper access control in Windows Hyper-V allows an authorized attacker to
  disclose information locally.
summary: >-
  Improper access control in Windows Hyper-V allows an authorized attacker to
  disclose information locally.
severity: medium
cvss: 4.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-284
vendor: microsoft
product: windows_10_1809
affected:
  - windows_10_1809 < 10.0.17763.8276
  - windows_10_21h2 < 10.0.19044.6809
  - windows_10_22h2 < 10.0.19045.6809
  - windows_11_23h2 < 10.0.22631.6491
  - windows_11_24h2 < 10.0.26100.7623
  - windows_11_25h2 < 10.0.26200.7623
  - windows_server_2019 < 10.0.17763.8276
  - windows_server_2022 < 10.0.20348.4648
  - windows_server_2022_23h2 < 10.0.25398.2092
  - windows_server_2025 < 10.0.26100.32230
patched:
  - windows_10_1809 10.0.17763.8276
  - windows_10_21h2 10.0.19044.6809
  - windows_10_22h2 10.0.19045.6809
  - windows_11_23h2 10.0.22631.6491
  - windows_11_24h2 10.0.26100.7623
  - windows_11_25h2 10.0.26200.7623
  - windows_server_2019 10.0.17763.8276
  - windows_server_2022 10.0.20348.4648
  - windows_server_2022_23h2 10.0.25398.2092
  - windows_server_2025 10.0.26100.32230
published: '2026-01-13'
updated: '2026-07-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-20825'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20825'
    label: secure@microsoft.com
tags:
  - nvd
epss: 0.0054
epssPercentile: 0.42975
ingestedAt: '2026-07-31T06:58:51.572Z'
---

## Overview

Improper access control in Windows Hyper-V allows an authorized attacker to disclose information locally.

## Affected

- `windows_10_1809 < 10.0.17763.8276`
- `windows_10_21h2 < 10.0.19044.6809`
- `windows_10_22h2 < 10.0.19045.6809`
- `windows_11_23h2 < 10.0.22631.6491`
- `windows_11_24h2 < 10.0.26100.7623`
- `windows_11_25h2 < 10.0.26200.7623`
- `windows_server_2019 < 10.0.17763.8276`
- `windows_server_2022 < 10.0.20348.4648`
- `windows_server_2022_23h2 < 10.0.25398.2092`
- `windows_server_2025 < 10.0.26100.32230`

## Remediation

Upgrade past the affected range:

- `windows_10_1809 10.0.17763.8276`
- `windows_10_21h2 10.0.19044.6809`
- `windows_10_22h2 10.0.19045.6809`
- `windows_11_23h2 10.0.22631.6491`
- `windows_11_24h2 10.0.26100.7623`
- `windows_11_25h2 10.0.26200.7623`
- `windows_server_2019 10.0.17763.8276`
- `windows_server_2022 10.0.20348.4648`
- `windows_server_2022_23h2 10.0.25398.2092`
- `windows_server_2025 10.0.26100.32230`