CVE-2026-50659

.NET Spoofing Vulnerability

State: Published
Severity: 6.5 Medium
Published: Jul 14, 2026
Updated: Nov 1, 2026
Reserved: Jun 5, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	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	microsoft

Weaknesses

CWE-116 Improper Encoding or Escaping of Output

Affected Products

Product	Versions
.NET 10.0 runtimeMicrosoft	10.0.0 to before 10.0.10Affected
.NET 8.0 runtimeMicrosoft	8.0.0 to before 8.0.29Affected
.NET 9.0 runtimeMicrosoft	9.0.0 to before 9.0.18Affected
Microsoft .NET Framework 3.5Microsoft	3.5.0 to before 2.0.50727.8983 & 3.0.30729.8978Affected
Microsoft .NET Framework 3.5 AND 4.7.2Microsoft	4.7.0 to before 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0Affected
Microsoft .NET Framework 3.5 AND 4.8Microsoft	4.8.0 to before 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0Affected
Microsoft .NET Framework 3.5 AND 4.8.1Microsoft	4.8.1 to before 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0Affected
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2Microsoft	4.7.0 to before 4.7.4143.0Affected
Microsoft .NET Framework 4.8Microsoft	4.8.0 to before 4.8.4803.0Affected
Microsoft .NET Framework 4.8.1Microsoft	4.8.0.0 to before 4.8.9340.0Affected
Microsoft Visual Studio 2022 version 17.12Microsoft	17.12.0 to before 17.12.22Affected
Microsoft Visual Studio 2022 version 17.14Microsoft	17.14.0 to before 17.14.36Affected
Microsoft Visual Studio 2026 version 18.7Microsoft	18.0 to before 18.7.4Affected

References

.NET Spoofing Vulnerabilityvendor-advisorypatch

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