Windows 11 security update fixes actively exploited zero-day flaw
Brief
Microsoft has released the August 2026 cumulative update for Windows 11, fixing 236 Windows vulnerabilities, including a privilege-escalation flaw that is already being exploited in attacks. The KB5121003 update was released earlier today for Windows 11 versions 24H2, 25H2, and 26H1, bringing systems to builds 26100. 9168 and 26200.
- It is part of Microsoft’s broader August …
The post Windows 11 security update fixes actively exploited zero-day flaw appeared first on CyberInsider .