ResolvedWindows 10 Version 1809
Microsoft Patches Actively Exploited Windows 10 1809 Flaws in Emergency Update KB5091573
Microsoft released KB5091573 on April 19, 2026, an out-of-band security update for Windows 10 Version 1809 patching CVE-2026-28301 through CVE-2026-28304. The vulnerabilities have been actively exploited in the wild.