Desktop Window Manager Elevation of Privilege Vulnerability

Use after free in Desktop Window Manager allows an authorized attacker to elevate privileges locally.

Read the vendor bulletin Get alerts for Windows Server 2025 (Server Core installation)

7.0CVSS out of 10High severity

Scope

What the vendor says is affected

Windows Server 2025 (Server Core installation)
Windows 11 Version 25H2 for ARM64-based Systems
Windows 11 Version 25H2 for x64-based Systems
Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 23H2 for x64-based Systems
Windows 11 Version 24H2 for ARM64-based Systems
Windows 11 Version 24H2 for x64-based Systems
Windows Server 2025
Windows 11 version 26H1 for x64-based Systems
Windows 11 Version 26H1 for ARM64-based Systems

Versions the vendor lists as fixed

10.0.26100.33296
10.0.26100.33222
10.0.26200.9168
10.0.26200.9106
10.0.22631.7517
10.0.26100.9168
10.0.26100.9106
10.0.28000.2704

Next step

What the vendor recommends

Install KB5120233. Install KB5120228. Install KB5121003. Install KB5120994. Install KB5120240. Install KB5121000.

Review the complete instructions on the vendor's site

Update history

What changed in later vendor updates

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

Aug 20, 2026 at 7:00 PM UTC
- The vendor changed its remediation guidance.

Timeline

When this advisory changed

Aug 11, 2026 at 7:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Aug 20, 2026 at 6:50 PM UTC
Added to SecurityAlert
We collected the advisory from the official source.
Sep 2, 2026 at 5:15 PM UTC
Confirmed at the source
Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2026-65788View CVSS, KEV, EPSS, and threat context

Source

Start with the vendor's bulletin

SecurityAlert organizes the fields the vendor published. The original bulletin remains the source of record for affected versions, fixes, and later changes.

Vendor: Microsoft Security Response Center
Advisory ID: CVE-2026-65788
Last source check: Sep 13, 2026 at 2:40 AM UTC

Open the official bulletin How SecurityAlert builds this record

Your environment

Check the systems you actually run

A vendor advisory can tell you what may be affected. It cannot tell you whether that product and version are installed in your environment.

Confirm the product and installed version.
Read the vendor's prerequisites and exceptions.
Test the update or mitigation through your normal change process.

Watch Windows Server 2025 (Server Core installation)

Keep following

Get new Microsoft Security Response Center advisories

Use the vendor-specific RSS feed or set up alerts for a product your team relies on.

Follow this vendor's RSS feed

What the vendor says is affected

Versions the vendor lists as fixed

What the vendor recommends

What changed in later vendor updates

When this advisory changed

CVEs named in this advisory

Related advisories from Microsoft Security Response Center

Windows Update Stack Elevation of Privilege Vulnerability

Chromium CVE-2026-76023: Improper resource control in Linux Toolkit Theming

Chromium CVE-2026-76022: Buffer overflow in Network

Chromium CVE-2026-76021: Use after free in DOM

Chromium CVE-2026-76019: Incorrect authorization in Workers

Chromium CVE-2026-76018: Privilege elevation in Import