Microsoft Security Response CenterCVE-2026-42913

Remote Desktop Client Remote Code Execution Vulnerability

Concurrent execution using shared resource with improper synchronization ('race condition') in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

Read the vendor bulletin Get alerts for Remote Desktop client for Windows Desktop

7.5CVSS out of 10High severity

Scope

What the vendor says is affected

Remote Desktop client for Windows Desktop
Windows Server 2022
Windows Server 2022 (Server Core installation)
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

1.2.7214.0
10.0.20348.5256
10.0.26100.32995
10.0.26200.8655
10.0.22631.7219
10.0.26100.8655
10.0.28000.2269

Next step

What the vendor recommends

Release Notes Install KB5094128. Install KB5094125. Install KB5094126. Install KB5093998. Install KB5095051.

Review the complete instructions on the vendor's site

Timeline

When this advisory changed

Jun 9, 2026 at 7:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Sep 28, 2026 at 11:20 AM UTC
Added to SecurityAlert
We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-42913View CVSS, KEV, EPSS, and threat context

Source

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Vendor: Microsoft Security Response Center
Advisory ID: CVE-2026-42913
Last source check: Sep 28, 2026 at 11:20 AM UTC

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Your environment

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Watch Remote Desktop client for Windows Desktop

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What the vendor says is affected

Versions the vendor lists as fixed

What the vendor recommends

When this advisory changed

CVEs named in this advisory

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