KB5126146: Overview with user sentiment and feedback
Last Updated October 22, 2026
Probability of successful installation and continued operation of the machine
Overview
KB5126146 is the September 8, 2026 cumulative update for .NET Framework 3.5, 4.8 and 4.8.1 on Windows 10 Version 22H2. It addresses two security vulnerabilities (CVE-2026-62886 elevation of privilege and CVE-2026-69522 remote code execution) plus quality fixes. It is delivered via Windows Update, WSUS, and the Microsoft Update Catalog.
General Purpose
- Fixes CVE-2026-62886, a .NET Framework elevation of privilege vulnerability
- Fixes CVE-2026-69522, a .NET Framework remote code execution vulnerability
- Includes additional quality and reliability improvements, detailed in linked KB articles (5126046, 5126421)
- Applies to Windows 10 Version 22H2 (and 21H2 via linked articles)
General Sentiment
Official Microsoft documentation lists no known issues for this update. One Microsoft Community thread reports File History stopped working after a batch of September 2026 updates, including KB5126146, though the poster did not isolate this update as the cause. Coverage is limited, so the signal is weak and does not point specifically at the .NET component.
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 2026-10-22 02:04 AM
