CRITICAL 9.8 Microsoft

CVE-2026-54990

Remote Desktop Client Remote Code Execution Vulnerability

Microsoft Security Update 2026-Jul: Remote Desktop Client Remote Code Execution Vulnerability

Affected Products

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 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

References

Published: 2026-07-14 · Source: Microsoft · Feed updated: 2026-09-18

This critical severity vulnerability with a CVSS score of 9.8 was published on 2026-07-14 via Microsoft. Affected: Windows Server 2025 (Server Core installation), Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems and 5 more.

Risk Timeline

CVE Disclosed2026-07-14 · 65 days ago

Remediation Resources

Official Advisory

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54990

NVD / MITRE

nvd.nist.gov/vuln/detail/CVE-2026-54990

Related Vulnerabilities

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CVE-2026-62815	Microsoft QUIC Remote Code Execution Vulnerability	CRITICAL	9.8
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