CVE-2026-50659

.NET Spoofing Vulnerability

Published Jul 14, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-74jp-vm22-8q8x Microsoft Security Advisory CVE-2026-50659 – .NET Spoofing Vulnerability
Ubuntu USN Ubuntu USN USN-8553-1 .NET vulnerabilities
History
Type Values Removed Values Added
First Time appeared Microsoft microsoft Visual Studio 2022
Vendors & Products Microsoft microsoft Visual Studio 2022
Type Values Removed Values Added
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Weaknesses CWE-838
CPEs cpe:/a:redhat:enterprise_linux:8
cpe:/a:redhat:enterprise_linux:9
cpe:/a:redhat:hummingbird:1
cpe:/o:redhat:enterprise_linux:10.2
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
References
Metrics threat_severity

None

threat_severity

Moderate

Type Values Removed Values Added
First Time appeared Microsoft .net Framework
CPEs cpe:2.3:a:microsoft:.net_framework:*:*:*:*:*:*:*:*
Vendors & Products Microsoft .net Framework
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.
Title .NET Spoofing Vulnerability
First Time appeared Microsoft
Microsoft .net
Microsoft visual Studio 2022
Microsoft visual Studio 2026
Weaknesses CWE-116
CPEs cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2026:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft .net
Microsoft visual Studio 2022
Microsoft visual Studio 2026
References
Metrics cvssV3_1

{'score': 6.5, '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'}