What is CVE-2026-62871?

CVE-2026-62871 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. .NET Elevation of Privilege Vulnerability

Which CVE IDs does CVE-2026-62871 cover?

CVE-2026-62871 covers the following CVE IDs: CVE-2026-62871. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-62871?

CVE-2026-62871 has a CVSS v3 base score of 7.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-62871?

CVE-2026-62871 affects 4 products, including: .NET 8.0 installed on Windows; .NET 9.0 installed on Windows; Microsoft Visual Studio 2022 version 17.14; Microsoft Visual Studio 2026 version 18.8.

CVE-2026-62871HighCVSS 7.8

.NET Elevation of Privilege Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

August 14, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-62871 →

📋 Description

Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.

🎯 Affected products4

.NET 8.0 installed on Windows
.NET 9.0 installed on Windows
Microsoft Visual Studio 2022 version 17.14
Microsoft Visual Studio 2026 version 18.8

✅ Remediation

KB5122104 (Security Update) — fixed build 8.0.30 KB5122105 (Security Update) — fixed build 9.0.19 Security Update — fixed build 18.8.3 Security Update — fixed build 17.14.38

🔗 References (5)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62871
patchhttps://dotnet.microsoft.com/download/dotnet/8.0
referencehttps://support.microsoft.com/help/5122104
patchhttps://dotnet.microsoft.com/download/dotnet/9.0
referencehttps://support.microsoft.com/help/5122105