Bleepingcomputer August 2026 Patch Tuesday Updates Address Security Vulnerabilities in Windows 10 and 11
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- •Microsoft released mandatory updates for Windows 10 and 11 on August 11, 2026.
- •Windows 11 updates fix 400 vulnerabilities, while Windows 10 addresses File History and Secure Boot.
- •Users are urged to install updates promptly to mitigate security risks.
On August 11, 2026, Microsoft released mandatory cumulative updates KB5121003 and KB5120240 for Windows 11, and KB5120249 for Windows 10. These updates address security vulnerabilities and bugs across various versions of Windows. The Windows 11 updates fix 400 vulnerabilities, while the Windows 10 update specifically addresses issues with File History backups and expands Secure Boot coverage. Users are advised to install these updates promptly to mitigate potential security risks. The updates can be installed via Windows Update or manually from the Microsoft Update Catalog. No new issues have been reported with these updates as of now.
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Timeline
2026-08-11
Windows 11 KB5121003 & KB5120240 updates released
Updates released to fix 400 vulnerabilities and improve performance across Windows 11 versions.
Bleepingcomputer2026-08-11
Windows 10 KB5120249 update released
Mandatory update released to fix File History backups and expand Secure Boot certificate deployment.
Bleepingcomputer2026-08-11
Windows 10 update details confirmed
The update addresses issues with SMB backups and improves security features for Windows 10.
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