Microsoft Issues Extensive September 2026 Security Updates, Patching Two Actively Exploited Zero-Day Vulnerabilities

Microsoft's September 2026 Patch Tuesday includes 974 vulnerability fixes across its products, a record number. Crucially, it addresses two actively exploited zero-day flaws: CVE-2026-81963 in Windows Update Stack and CVE-2026-85880 in Windows ALPC. These vulnerabilities could grant attackers SYSTEM-level privileges, making immediate patching critical for organizations to mitigate significant security risks.