CVE-2026-50659: .NET Spoofing Vulnerability

Overview

Severity

Medium (CVSS 6.5)

CVSS Vector

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

Category

Spoofing

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Jul

Released

2026-07-14

Description

Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.

Affected Products (11)

Developer Tools

• Microsoft Visual Studio 2022 version 17.12
• .NET 10.0 installed on Linux
• .NET 10.0 installed on Mac OS
• .NET 8.0 installed on Windows
• .NET 8.0 installed on Linux
• .NET 8.0 installed on Mac OS
• .NET 9.0 installed on Linux
• Microsoft Visual Studio 2022 version 17.14
• .NET 9.0 installed on Mac OS
• .NET 9.0 installed on Windows
• Microsoft Visual Studio 2026 version 18.7

Security Updates (6)

• Release Notes
• 5104034
• 5104032
• 5104033
• Release Notes
• Release Notes

Acknowledgments

hamayanhamayan

Revision History

• 2026-07-14: Information published.