KB5120747: Overview with user sentiment and feedback

Overview

KB5120747 is a cumulative security update for .NET Framework 3.5 released on August 11, 2026, targeting Windows 11 version 26H1 (build 28000) and later. This update delivers the complete .NET Framework 3.5 product as a full standalone installer rather than incremental patches, replacing any previously installed version. The update addresses multiple critical security vulnerabilities including elevation of privilege and remote code execution issues.

General Purpose

• Addresses six security vulnerabilities: two elevation of privilege flaws (CVE-2026-65810, CVE-2026-62872), three remote code execution vulnerabilities (CVE-2026-62886, CVE-2026-62897, CVE-2026-70354), and one information disclosure issue (CVE-2026-62902)
• Delivers complete .NET Framework 3.5 product installation as a full replacement rather than traditional incremental patching
• Available through Microsoft Update, Microsoft Update Catalog, and Windows Server Update Services (WSUS)
• Requires system restart after installation and recommends closing all .NET Framework-based applications beforehand

General Sentiment

Microsoft has reported no known issues with this update as of the release date. The update focuses on addressing significant security vulnerabilities without introducing quality or reliability improvements. Given the absence of reported community issues and the straightforward nature of the security fixes, this appears to be a stable release. The full product replacement approach may require more careful planning for enterprise deployments compared to traditional incremental updates.

Known Issues

Disclaimer: We take measures to ensure that AI-generated content is of the highest possible quality, but we cannot guarantee its accuracy and recommend that users do their own independent research. Generated on 2026-09-04 07:21 PM

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