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CVE-2026-69439— .NET and Visual Studio Elevation of Privilege Vulnerability

Quick assessment

Affected

Microsoft .NET 10.0 runtime

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公司开源的一款软件开发框架。 Microsoft .NET 10.0 10.0.12之前版本、.NET 11.0 11.0 RC1之前版本、.NET 8.0 8.0.31之前版本、.NET 9.0 9.0.20之前版本、Microsoft Visual Studio 2022 version 17.14 17.14.40之前版本和Microsoft Visual Studio 2026 version 18.9 18.9.3之前版本存在缓冲区错误漏洞，该

CVSS 8.8 · High EPSS 0.82% · P57 Updated Nov 01, 2026

Possible ATT&CK Techniques 2 AI

T1069 · Permission Groups Discovery T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

Vendor	Product	Version Range	Status
Microsoft	.NET 10.0 runtime	`10.0.0< 10.0.12`	affected
Microsoft	.NET 11.0 runtime	`11.0.0< 11.0 RC1`	affected
Microsoft	.NET 8.0 runtime	`8.0.0< 8.0.31`	affected
Microsoft	.NET 9.0 runtime	`9.0.0< 9.0.20`	affected
Microsoft	Microsoft Visual Studio 2022 version 17.14	`17.14.0< 17.14.40`	affected
Microsoft	Microsoft Visual Studio 2026 version 18.9	`18.9.0< 18.9.3`	affected

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I. Basic Information for CVE-2026-69439

Vulnerability Information

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Vulnerability Title

.NET and Visual Studio Elevation of Privilege Vulnerability

Source: CVE Program / CVE List V5

Vulnerability Description

Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

堆缓冲区溢出

Source: CVE Program / CVE List V5

Vulnerability Title

Microsoft .NET 缓冲区错误漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

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
Microsoft	.NET 10.0 runtime	10.0.0 ~ 10.0.12	-
Microsoft	.NET 11.0 runtime	11.0.0 ~ 11.0 RC1	-
Microsoft	.NET 8.0 runtime	8.0.0 ~ 8.0.31	-
Microsoft	.NET 9.0 runtime	9.0.0 ~ 9.0.20	-
Microsoft	Microsoft Visual Studio 2022 version 17.14	17.14.0 ~ 17.14.40	-
Microsoft	Microsoft Visual Studio 2026 version 18.9	18.9.0 ~ 18.9.3	-

II. Public POCs for CVE-2026-69439

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-69439

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Vendor Advisories for CVE-2026-69439 (1)

🔗 CVE-2026-69439 - Security Update Guide - Microsoft - .NET and Visual Studio Elevation of Privilege Vulnerability vendor-advisory patch

https://www.cve.org/CVERecord?id=CVE-2026-69439

Same Patch Batch · Microsoft · 2026-09-08 · 966 CVEs total

CVE-2026-83941	9.9 CRITICAL	Entra ID Elevation of Privilege Vulnerability
CVE-2026-69579	9.8 CRITICAL	Windows Message Queuing Remote Code Execution Vulnerability
CVE-2026-69824	9.8 CRITICAL	Microsoft Standard XPS Remote Code Execution Vulnerability
CVE-2026-69586	9.8 CRITICAL	Microsoft Windows PDF Remote Code Execution Vulnerability
CVE-2026-69496	9.8 CRITICAL	Windows Compressed Folder Remote Code Execution Vulnerability
CVE-2026-69845	9.8 CRITICAL	Windows DHCP Server Remote Code Execution Vulnerability
CVE-2026-69829	9.8 CRITICAL	Windows Shell Remote Code Execution Vulnerability
CVE-2026-69493	9.8 CRITICAL	Windows Event Logging Service Remote Code Execution Vulnerability
CVE-2026-69769	9.8 CRITICAL	Windows HTTP Print Provider Remote Code Execution Vulnerability
CVE-2026-78509	9.8 CRITICAL	Microsoft Office Outlook Remote Code Execution Vulnerability
CVE-2026-72979	9.8 CRITICAL	Windows DHCP Server Remote Code Execution Vulnerability
CVE-2026-69276	9.8 CRITICAL	Microsoft UxTheme Library (uxtheme.dll) Remote Code Execution Vulnerability
CVE-2026-72983	9.8 CRITICAL	Internet Connection Sharing (ICS) Remote Code Execution Vulnerability
CVE-2026-72982	9.8 CRITICAL	Windows Netlogon Remote Code Execution Vulnerability
CVE-2026-69730	9.8 CRITICAL	Windows DNS Server Remote Code Execution Vulnerability
CVE-2026-69431	9.8 CRITICAL	Telnet Client Remote Code Execution Vulnerability
CVE-2026-69595	9.8 CRITICAL	Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
CVE-2026-68839	9.8 CRITICAL	Windows USB Mass Storage Class Driver Remote Code Execution Vulnerability
CVE-2026-69491	9.8 CRITICAL	Microsoft DirectMusic Remote Code Execution Vulnerability
CVE-2026-69910	9.8 CRITICAL	Windows Hyper-V Remote Code Execution Vulnerability

Showing top 20 of 966 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: .NET 10.0 runtime

Same vendor: Microsoft

Same weakness: CWE-122