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CVE-2026-50659— .NET Spoofing Vulnerability

Quick assessment

Affected
Microsoft .NET 10.0
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft .NET是美国Microsoft公司的一个致力于敏捷软件开发、快速应用开发、平台无关性和网络透明化的软件框架。 Microsoft .NET存在输出处理不当漏洞，该漏洞源于对输出内容进行编码或转义处理不当，可能导致已授权的攻击者通过网络进行欺骗攻击。

CVSS 6.5 · Medium EPSS 0.74% · P53

Affected Version Matrix 13

VendorProduct Version RangeStatus
Microsoft .NET 10.0 10.0.0< 10.0.10 affected
Microsoft .NET 8.0 8.0.0< 8.0.29 affected
Microsoft .NET 9.0 9.0.0< 9.0.18 affected
Microsoft Microsoft .NET Framework 3.5 3.5.0< 2.0.50727.8983 & 3.0.30729.8978 affected
Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 4.7.0< 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 affected
Microsoft Microsoft .NET Framework 3.5 AND 4.8 4.8.0< 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 affected
Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 4.8.1< 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 affected
Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.0< 4.7.4143.0 affected
Microsoft Microsoft .NET Framework 4.8 4.8.0< 4.8.4803.0 affected
Microsoft Microsoft .NET Framework 4.8.1 4.8.0.0< 4.8.9340.0 affected
Microsoft Microsoft Visual Studio 2022 version 17.12 17.12.0< 17.12.22 affected
Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.0< 17.14.36 affected
Microsoft Microsoft Visual Studio 2026 version 18.7 18.0< 18.7.4 affected
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I. Basic Information for CVE-2026-50659

Vulnerability Information
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Vulnerability Title
.NET Spoofing Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对输出编码和转义不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft .NET 输出处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft .NET是美国Microsoft公司的一个致力于敏捷软件开发、快速应用开发、平台无关性和网络透明化的软件框架。 Microsoft .NET存在输出处理不当漏洞，该漏洞源于对输出内容进行编码或转义处理不当，可能导致已授权的攻击者通过网络进行欺骗攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

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

II. Public POCs for CVE-2026-50659

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III. Intelligence Information for CVE-2026-50659

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Vendor Advisories for CVE-2026-50659 (1)

Same Patch Batch · Microsoft · 2026-07-14 · 570 CVEs total

CVE-2026-57092 9.9 CRITICAL Microsoft Windows VMSwitch Elevation of Privilege Vulnerability
CVE-2026-56190 9.8 CRITICAL Remote Desktop Protocol Remote Code Execution Vulnerability
CVE-2026-50518 9.8 CRITICAL Windows DHCP Server Remote Code Execution Vulnerability
CVE-2026-56159 9.8 CRITICAL DHCP Server Service Remote Code Execution Vulnerability
CVE-2026-42990 9.8 CRITICAL SQL Server ODBC driver Elevation of Privilege Vulnerability
CVE-2026-55944 9.8 CRITICAL Microsoft Dynamics NAV and Microsoft Dynamics 365 Business Central (On Premises) Remote Co
CVE-2026-54118 9.8 CRITICAL Microsoft SQL Server Remote Code Execution Vulnerability
CVE-2026-56188 9.8 CRITICAL Windows Server Network driver Remote Code Execution Vulnerability
CVE-2026-54117 9.8 CRITICAL Microsoft SQL Server Remote Code Execution Vulnerability
CVE-2026-58644 9.8 CRITICAL Microsoft SharePoint Remote Code Execution Vulnerability
CVE-2026-50522 9.8 CRITICAL Microsoft SharePoint Remote Code Execution Vulnerability
CVE-2026-54990 9.8 CRITICAL Remote Desktop Client Remote Code Execution Vulnerability
CVE-2026-50447 9.8 CRITICAL Windows Message Queuing Service (MSMQ) Remote Code Execution Vulnerability
CVE-2026-55010 9.8 CRITICAL Minecraft Bedrock Dedicated Server Remote Code Execution Vulnerability
CVE-2026-49172 9.8 CRITICAL Windows FTP Service Remote Code Execution Vulnerability
CVE-2026-48561 9.6 CRITICAL Microsoft Edge Copilot Remote Code Execution Vulnerability
CVE-2026-50380 9.6 CRITICAL Windows GDI+ Remote Code Execution Vulnerability
CVE-2026-55008 9.6 CRITICAL Microsoft Exchange Server Spoofing Vulnerability
CVE-2026-49798 9.3 CRITICAL Windows Kernel Elevation of Privilege Vulnerability
CVE-2026-55040 9.1 CRITICAL Microsoft SharePoint Server Security Feature Bypass Vulnerability

Showing top 20 of 570 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: .NET 10.0
Same vendor: Microsoft
Same weakness: CWE-116

V. Comments for CVE-2026-50659

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