 Saturday, September 12, 2026 in Windows  No Comments |  | This Patch Tuesday is Microsoft`s largest security update ever.
Today is Microsoft`s September 2026 Patch Tuesday, with security updates released for a record-breaking 966 flaws, including two actively exploited zero-day vulnerabilities.
This Patch Tuesday addresses 105 'Critical' vulnerabilities, 81 of which are remote code execution, 20 are elevation of privileges, 2 are information disclosure, and 1 security feature bypass.
The approximate number of bugs in each vulnerability category is listed below:
- 438 Elevation of Privilege Vulnerabilities
- 19 Security Feature Bypass Vulnerabilities
- 258 Remote Code Execution Vulnerabilities
- 173 Information Disclosure Vulnerabilities
- 56 Denial of Service Vulnerabilities
- 16 Spoofing Vulnerabilities
When BleepingComputer reports on Patch Tuesday security updates, we only count vulnerabilities released by Microsoft on Patch Tuesday itself.
Therefore, today`s total does not include 204 flaws fixed earlier this month, including vulnerabilities in Azure AI Language, Azure Cosmos DB, Copilot Studio, Entra ID, Mariner, Microsoft Azure Active Directory B2C, Microsoft Discovery Studio, Microsoft Edge (Chromium-based), Microsoft Fabric, and Power Automate.
This Patch Tuesday is Microsoft`s largest security update ever, marking a significant increase over other recent massive releases, including the 570 security flaws fixed in July and 400 fixed in August.
The increase in Patch Tuesday security updates comes after Microsoft began using an AI-powered vulnerability discovery system to identify more security flaws across its software products.
To learn more about the non-security updates released today, you can review our dedicated articles on the Windows 11 KB5124008 & KB5122880 cumulative updates and the Windows 10 KB5122878 extended security update.
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