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MEDIUM · 6.5

CVE-2026-50659

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

Vulnerability Description

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

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE

Affected Products

VendorProductVersions
Microsoft.Net Framework4.8.1
MicrosoftWindows 11 26H1-
MicrosoftWindows 10 1607-
MicrosoftWindows Server 2012-
MicrosoftWindows Server 2016-
Microsoft.Net>= 8.0.0, < 8.0.29
AppleMacos-
LinuxLinux Kernel-
MicrosoftWindows-
MicrosoftWindows 10 21H2-
MicrosoftWindows 10 22H2-
MicrosoftWindows 11 23H2-
MicrosoftWindows 11 24H2-
MicrosoftWindows 11 25H2-
MicrosoftWindows Server 2022-
MicrosoftWindows 10 1809-
MicrosoftWindows Server 2019-
MicrosoftVisual Studio 2022>= 17.12.0, < 17.12.22
MicrosoftVisual Studio 2026>= 18.7.0, < 18.7.4

Related Weaknesses (CWE)

CWE-116

References

FAQ

What is CVE-2026-50659?

CVE-2026-50659 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.

How severe is CVE-2026-50659?

CVE-2026-50659 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-50659?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft .Net Framework, Microsoft Windows 11 26H1, Microsoft Windows 10 1607, Microsoft Windows Server 2012, Microsoft Windows Server 2016.