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Patch Tuesday

Microsoft Patch Tuesday — September 2026

Who it affects
See the summary below.

Microsoft Patch Tuesday – September 2026

Patch Summary

  • Total Patches: 1,240
  • Critical: 120
  • Important: 925
  • Moderate: 125
  • Low: 70

Zero-Day Vulnerabilities

CVETitleCVSSSeverityStatus
CVE-2026-81963Windows Update Stack Elevation of Privilege Vulnerability7.8ImportantActively Exploited
CVE-2026-85880Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability7.8ImportantActively Exploited

Priority Guidance for MSPs

Immediate Action Required:

  • Deploy patches for both zero-day vulnerabilities (CVE-2026-81963, CVE-2026-85880) due to active exploitation
  • Prioritize all 120 Critical patches in your update cycle

Standard Deployment:

  • Schedule 925 Important patches within standard maintenance windows
  • Remaining Moderate and Low patches can follow regular cadence

Key Risk: Both active zero-days target privilege escalation pathways (Windows Update Stack and ALPC), requiring urgent remediation across all Windows systems.

Data as of September 14, 2026. Sources: api.msrc.microsoft.com, msrc.microsoft.com. Figures are pulled from public vendor and security data and refreshed automatically.
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