Microsoft’s Windows 10 KB5078885 Update Fixes 79 Vulnerabilities
Summary
Microsoft’s March 2026 Windows 10 KB5078885 update addresses 79 vulnerabilities, including two actively exploited zero-days, fixes a Secure Launch shutdown issue, and expands delivery of replacement Secure Boot certificates.
Key points
- KB5078885 updates supported Windows 10 systems to build 19045.7058, or build 19044.7058 for LTSC 2021.
- The update addresses 79 vulnerabilities, including two described as actively exploited zero-days.
- It fixes a problem that could cause Secure Launch-capable PCs with Virtual Secure Mode enabled to restart instead of shutting down or hibernating.
- Microsoft is expanding the phased rollout of replacement Secure Boot certificates ahead of the June 2026 expiration of the 2011 certificates.
- The update is available through Windows Update for Enterprise LTSC and ESU-enrolled devices.
Article Details
- Event Type
- Windows 10 extended security update release
- Impact
- KB5078885 addresses 79 vulnerabilities, including two actively exploited zero-day flaws, and fixes a shutdown and hibernation issue affecting some Secure Launch-capable devices with Virtual Secure Mode enabled. It also supports the phased rollout of replacement Secure Boot certificates ahead of the June 2026 expiration of the 2011 certificates.