3 OctRestore deleted or older files in OneDrive3 OctRun the Windows Update troubleshooter3 OctWindows File Recovery: recover permanently deleted files with winfr3 OctHow to update drivers in Windows 11 and 10 (roll back, reinstall)3 OctDisable Fast Startup in Windows 11 and 103 OctUse System Restore in Windows 11 and Windows 103 OctHow to stop apps from opening on startup3 OctRun Startup Repair in Windows 11 (fix the Automatic Repair loop)

KB5120703: what it fixes and who gets it

KB5120703 is a security update from Microsoft's August 2026 release for Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019.

Microsoft data read
4CVEs fixed
0rated Critical
0already exploited
Norestart required

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 KB5120703

CVETypeCVSSSeverity
CVE-2026-62872.NET Framework Elevation of Privilege VulnerabilityElevation of Privilege8.8Important
CVE-2026-65810.NET Framework Elevation of Privilege VulnerabilityElevation of Privilege7.8Important
CVE-2026-70354.NET Core Remote Code Execution VulnerabilityRemote Code Execution7.8Important
CVE-2026-62897.NET Framework Remote Code Execution VulnerabilityRemote Code Execution7.0Important

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