Microsoft .NET Framework Update Version 5126053
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Update Summary
September 8, 2026 cumulative update for .NET Framework addresses CVE-2026-62886 and CVE-2026-69522. Microsoft reports no known issues and no new quality or reliability improvements.
Update Details
Security
- Addresses CVE-2026-62886, an elevation of privilege vulnerability.
- Addresses CVE-2026-69522, a remote code execution vulnerability.
Known Issues
- Microsoft is not currently aware of any issues in this update.
Hints
- For Windows 11, version 26H1 (build 28000) and newer, the .NET Framework 3.5 product update 5120747 installs the full .NET Framework 3.5 product as a standalone installer and replaces any previously installed version.
- The operating system KB listed in the tables is used for update offering; the specific .NET Framework package installed depends on the version already present on the device.
Product Information
Vendor: Microsoft
Product: .NET Framework
Product type: Other
Platform: Windows
Version: 5126053
Vendor release date: Sep 8, 2026
Original release notes: View on vendor site
Published on updatealert.io: Sep 10, 2026
Description: Developer runtime and framework for building and running Windows applications.