Summary
Microsoft released its October 2026 Patch Tuesday security update, addressing 1,411 vulnerabilities across its product portfolio. The monthly release includes patches for three zero-day vulnerabilities confirmed as actively exploited prior to disclosure.
What Happened
The three actively exploited zero-days span Windows core components. Two are elevation-of-privilege vulnerabilities allowing local attackers to gain SYSTEM-level access on compromised machines. The third is a remote code execution vulnerability in a Windows network service, exploitable without authentication under certain configurations.
Among the 1,411 total vulnerabilities, Microsoft has classified 28 as Critical severity. Affected products include Windows 10 and 11, Windows Server 2019 through 2025, Microsoft Office, Exchange Server, Azure components, and the .NET runtime.
Organizations running unpatched Windows systems exposed to the network are advised to apply the October updates as a matter of urgency. Windows Update and Windows Server Update Services will distribute patches automatically for systems with automatic updates enabled.
Domain Intelligence
microsoft.com — AEO Score: 65.94 / D
Domain registered 1991 via MarkMonitor. No adverse threat intelligence findings across independent sources reviewed.