Race condition in Microsoft products - CVE-2026-42909
Published: June 11, 2026
Vulnerability identifier: #VU134331
CSH Severity: High
CVSS v4.0: 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/E:U/U:Amber
CVE-ID: CVE-2026-42909
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Microsoft .NET Framework
Windows
Windows Server
Microsoft .NET Framework
Windows
Windows Server
Detailed vulnerability description
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.
How to mitigate CVE-2026-42909
Install updates from vendor's website.