---
id: CVE-2026-20819
title: >-
  Untrusted pointer dereference in Windows Virtualization-Based Security (VBS)
  Enclave allows an authorized attacker to disclose information locally.
summary: >-
  Untrusted pointer dereference in Windows Virtualization-Based Security (VBS)
  Enclave allows an authorized attacker to disclose information locally.
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-822
vendor: microsoft
product: windows_11_23h2
affected:
  - windows_11_23h2 < 10.0.22631.6491
  - windows_11_24h2 < 10.0.26100.7623
  - windows_11_25h2 < 10.0.26200.7623
patched:
  - windows_11_23h2 10.0.22631.6491
  - windows_11_24h2 10.0.26100.7623
  - windows_11_25h2 10.0.26200.7623
published: '2026-01-13'
updated: '2026-07-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-20819'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20819'
    label: secure@microsoft.com
tags:
  - nvd
epss: 0.00551
epssPercentile: 0.43666
ingestedAt: '2026-07-31T06:58:51.408Z'
---

## Overview

Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to disclose information locally.

## Affected

- `windows_11_23h2 < 10.0.22631.6491`
- `windows_11_24h2 < 10.0.26100.7623`
- `windows_11_25h2 < 10.0.26200.7623`

## Remediation

Upgrade past the affected range:

- `windows_11_23h2 10.0.22631.6491`
- `windows_11_24h2 10.0.26100.7623`
- `windows_11_25h2 10.0.26200.7623`