September 2026 Patch Tuesday roundup: Plugs for two zero day holes among almost 1,000 fixes in Windows

Possibly wormable bugs and two zero-day holes highlight the almost 1,000 fixes issued today by Microsoft in its September Patch Tuesday release . The 964 vulnerabilities, another record since Microsoft began using AI in the middle of the year to find holes, require customer action. Excluded are 174 third-party/open-source CVEs and 23 Chromium/Edge CVEs, as well as nine Microsoft mitigated vulnerabilities in applications like Azure, Entra, and Copilot Studio where no customer action is required.