CVE-2026-50465: Windows DNS Client Tampering Vulnerability

Overview

Severity

High (CVSS 7.1)

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H/E:U/RL:O/RC:C

Category

Tampering

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Jul

Released

2026-07-14

Description

Improper access control in Microsoft Windows DNS allows an authorized attacker to perform tampering locally.

Affected Products (8)

Windows

• 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

Security Updates (4)

• 5099536
• 5101650
• 5095051
• 5101649

Acknowledgments

<a href="https://www.linkedin.com/in/brandon-fisher-666bb01b8/">Brandon Fisher</a>, <a href="https://www.linkedin.com/in/brandon-fisher-666bb01b8/">Brandon Fisher</a>

Revision History

• 2026-07-14: Information published.