KB5063878

Microsoft security update released 2025-08-12. Fixes 61 CVEs.

Critical

Download KB5063878

Get the official update for KB5063878. The download and file size for each supported product are on the Microsoft Update Catalog page.

Microsoft Update Catalog: download KB5063878 Microsoft support article

Update summary

Released

2025-08-12

CVEs fixed

Max CVSS

9.8

Severity

Critical

Exploitation and severity

Fixes 61 CVEs. Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 36%.

Among the top 25% of tracked Microsoft updates by EPSS exploit probability.

What to do

Elevated priority: high severity or a meaningful exploitation probability, sooner if an affected product is internet-facing. Senserva flags whether KB5063878 is missing on your devices.

CVEs fixed by this update

CVE-2025-49743 CVE-2025-49751 CVE-2025-49761 CVE-2025-49762 CVE-2025-50154 CVE-2025-50155 CVE-2025-50156 CVE-2025-50157 CVE-2025-50158 CVE-2025-50159 CVE-2025-50160 CVE-2025-50161 CVE-2025-50162 CVE-2025-50163 CVE-2025-50164 CVE-2025-50165 CVE-2025-50166 CVE-2025-50167 CVE-2025-50168 CVE-2025-50169 CVE-2025-50170 CVE-2025-50171 CVE-2025-50172 CVE-2025-50173 CVE-2025-50176 CVE-2025-50177 CVE-2025-53131 CVE-2025-53132 CVE-2025-53133 CVE-2025-53134 CVE-2025-53135 CVE-2025-53136 CVE-2025-53137 CVE-2025-53138 CVE-2025-53140 CVE-2025-53141 CVE-2025-53142 CVE-2025-53143 CVE-2025-53144 CVE-2025-53145 CVE-2025-53147 CVE-2025-53148 CVE-2025-53149 CVE-2025-53151 CVE-2025-53153 CVE-2025-53154 CVE-2025-53155 CVE-2025-53156 CVE-2025-53716 CVE-2025-53718 CVE-2025-53719 CVE-2025-53720 CVE-2025-53721 CVE-2025-53722 CVE-2025-53723 CVE-2025-53724 CVE-2025-53725 CVE-2025-53726 CVE-2025-53766 CVE-2025-53778 CVE-2025-53779

Affected products

Windows 10 Version 1809 for x64-based Systems
Windows Server 2019
Windows Server 2019 (Server Core installation)

References

Microsoft support article Microsoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.