KB5120747: what it fixes and who gets it
KB5120747 is a security update from Microsoft's August 2026 release for Microsoft .NET Framework 3.5 on Windows 11 Version 26H1, Microsoft .NET Framework 3.5 on Windows 11 version 26H1.
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Should you install it?
Yes. It is a routine security update; none of its fixes are rated Critical or reported as exploited. Windows Update installs it automatically on supported home PCs.
If the installation fails or the PC misbehaves afterwards, note the exact error code first: the fix depends on it. Our update troubleshooting guides are linked on this page.
Security fixes in KB5120747
| CVE | Type | CVSS | Severity |
|---|---|---|---|
| CVE-2026-62872.NET Framework Elevation of Privilege Vulnerability | Elevation of Privilege | 8.8 | Important |
| CVE-2026-62886.NET Elevation of Privilege Vulnerability | Elevation of Privilege | 7.8 | Important |
| CVE-2026-65810.NET Framework Elevation of Privilege Vulnerability | Elevation of Privilege | 7.8 | Important |
| CVE-2026-70354.NET Core Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-62897.NET Framework Remote Code Execution Vulnerability | Remote Code Execution | 7.0 | Important |
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