Race condition in Microsoft products - CVE-2026-42913

Vulnerability identifier: #VU134332

CSH Severity: High

CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-42913

CWE-ID: CWE-362

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a race condition in Remote Desktop Client. A remote attacker can exploit the race and execute arbitrary code on the target system.

Microsoft Windows
Windows Server
Microsoft .NET Framework

Install updates from vendor's website.

Microsoft Windows - addressed in versions 10 1607 10.0.14393.9234, 11 23H2 10.0.22631.7219, 11 24H2 10.0.26100.8655, 11 25H2 10.0.26200.8655, 11 26H1 10.0.28000.2269
Windows Server - addressed in versions 2022 10.0.20348.5256, 2025 10.0.26100.8655, 2025 10.0.26100.32995
Microsoft .NET Framework - update to 1.2.7214.0

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42913

• Multiple vulnerabilities in Microsoft Remote Desktop Client