Microsoft has released the Windows 10 KB5099539 extended security update, which includes the July 2026 Patch Tuesday security updates addressing 570 vulnerabilities, along with additional security fixes.This update is part of the Extended Security Updates (ESU) program, which Microsoft extended for consumers until October 12, 2027.Users running Windows 10 Enterprise LTSC or enrolled in the ESU program can install the update via Windows Update.The update upgrades systems to build 19045.7548 and includes critical security patches, such as fixes for two exploited zero-day flaws and a record-breaking number of vulnerabilities.

Notable changes include updates to OLE Automation compatibility, File Explorer OneDrive shortcut functionality, Recycle Bin confirmation dialogs, and Secure Boot enhancements.The update also introduces security hardening for TDI transports, which may affect legacy applications.Microsoft advises IT administrators to transition to SHA-256 thumbprints for RDP security to avoid disruptions.Overall, the update emphasizes security improvements and bug fixes while extending support for older Windows 10 versions.