CVE-2026-50659

nvd nist

Published: Jul 14, 2026Modified: Oct 14, 2026

6.5

Vector

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

Exploitability: 2.8 / Impact: 3.6

Source: secure@microsoft.com (Secondary)

Description

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

Affected (19)

Products: Microsoft: .net Framework, .net, Visual Studio 2022, Visual Studio 2026

4 products

Configuration A

1 vulnerable · 2 platform

Vulnerable Software	Affected Versions
Microsoft .net Framework	Version 4.8.1

Running on/with	Platform Versions
Microsoft Windows 11 26h1	All versions
Microsoft Windows 11 26h1	All versions

Configuration B

1 vulnerable · 5 platform

Vulnerable Software	Affected Versions
Microsoft .net Framework	Version 4.8

Running on/with	Platform Versions
Microsoft Windows 10 1607	All versions
Microsoft Windows 10 1607	All versions
Microsoft Windows Server 2012	All versions
Microsoft Windows Server 2012	Version r2
Microsoft Windows Server 2016	All versions

Configuration C

4 vulnerable · 2 platform

Vulnerable Software	Affected Versions
Microsoft .net Framework	Version 4.6.2
Microsoft .net Framework	Version 4.7.1
Microsoft .net Framework	Version 4.7.2
Microsoft .net Framework	Version 4.7

Running on/with	Platform Versions
Microsoft Windows Server 2012	All versions
Microsoft Windows Server 2012	Version r2

Configuration D

2 vulnerable · 3 platform

Vulnerable Software	Affected Versions
Microsoft .net	8.0.0 ≤ version < 8.0.29
Microsoft .net	9.0.0 ≤ version < 9.0.18

Running on/with	Platform Versions
Apple Macos	All versions
Linux Linux Kernel	All versions
Microsoft Windows	All versions

Configuration E

1 vulnerable · 2 platform

Vulnerable Software	Affected Versions
Microsoft .net	10.0.0 ≤ version < 10.0.6

Running on/with	Platform Versions
Apple Macos	All versions
Linux Linux Kernel	All versions

Configuration F

2 vulnerable · 13 platform

Vulnerable Software	Affected Versions
Microsoft .net Framework	Version 3.5
Microsoft .net Framework	Version 4.8.1

Running on/with	Platform Versions
Microsoft Windows 10 21h2	All versions
Microsoft Windows 10 21h2	All versions
Microsoft Windows 10 21h2	All versions
Microsoft Windows 10 22h2	All versions
Microsoft Windows 10 22h2	All versions
Microsoft Windows 10 22h2	All versions
Microsoft Windows 11 23h2	All versions
Microsoft Windows 11 23h2	All versions
Microsoft Windows 11 24h2	All versions
Microsoft Windows 11 24h2	All versions
Microsoft Windows 11 25h2	All versions
Microsoft Windows 11 25h2	All versions
Microsoft Windows Server 2022	All versions

Configuration G

2 vulnerable · 10 platform

Vulnerable Software	Affected Versions
Microsoft .net Framework	Version 3.5
Microsoft .net Framework	Version 4.8

Running on/with	Platform Versions
Microsoft Windows 10 1809	All versions
Microsoft Windows 10 1809	All versions
Microsoft Windows 10 21h2	All versions
Microsoft Windows 10 21h2	All versions
Microsoft Windows 10 21h2	All versions
Microsoft Windows 10 22h2	All versions
Microsoft Windows 10 22h2	All versions
Microsoft Windows 10 22h2	All versions
Microsoft Windows Server 2019	All versions
Microsoft Windows Server 2022	All versions

Configuration H

2 vulnerable · 6 platform

Vulnerable Software	Affected Versions
Microsoft .net Framework	Version 3.5
Microsoft .net Framework	Version 4.7.2

Running on/with	Platform Versions
Microsoft Windows 10 1607	All versions
Microsoft Windows 10 1607	All versions
Microsoft Windows 10 1809	All versions
Microsoft Windows 10 1809	All versions
Microsoft Windows Server 2016	All versions
Microsoft Windows Server 2019	All versions

Configuration I

1 vulnerable · 4 platform

Vulnerable Software	Affected Versions
Microsoft .net Framework	Version 3.5

Running on/with	Platform Versions
Microsoft Windows 11 26h1	All versions
Microsoft Windows 11 26h1	All versions
Microsoft Windows Server 2012	All versions
Microsoft Windows Server 2012	Version r2

Configuration J

3 vulnerable

Vulnerable Software	Affected Versions
Microsoft Visual Studio 2022	17.12.0 ≤ version < 17.12.22
Microsoft Visual Studio 2022	17.14.0 ≤ version < 17.14.36
Microsoft Visual Studio 2026	18.7.0 ≤ version < 18.7.4

Related CWEs

CWE-116

Improper Encoding or Escaping of Output

The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50659

Source: secure@microsoft.com

PatchVendor Advisory

Timeline

No history available yet.