Microsoft August/September 2026 Security Updates

August 2026 Security Updates

This release consists of 421 Microsoft CVEs:

Product Family Updates per Product/Version Vulnerabilities Addressed Distinct Updates Type of Update
Azure 1 17 15 Individual
Defender 1 1 1 Cumulative
Developer Tools 1 26 36 Cumulative
Exchange Server 1 7 4 Cumulative
Office 1 98 11 Cumulative (except 2016)
Office 2016 1 98 18 Individual
Other 1 6 4 Individual
SharePoint Server 1 30 3 Cumulative
Windows 1 236 32 Cumulative

Notable CVEs

CVE ID Title Notable Item
CVE-2026-62832 Windows User Profile Service Elevation of Privilege Vulnerability Publicly Known
CVE-2026-68820 Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability Exploitation Detected

We are republishing 2 non-Microsoft CVEs:

CNA Tag CVE FAQs? Workarounds? Mitigations?
MITRE Windows TPM CVE-2026-6726 Yes No No
MITRE Windows TPM CVE-2026-6727 Yes No No

Security Update Guide Blog Posts

Date Blog Post
October 31, 2025 You asked, we delivered: Introducing new features for an improved security experience
October 28, 2025 Understanding CVE-2025-55315: What CISOs, security engineers, and sysadmins should know
October 22, 2025 Toward greater transparency: Introducing machine-readable Vulnerability Exploitability Xchange (VEX) for Azure Linux and beyond
November 12, 2024 Toward greater transparency: Publishing machine-readable CSAF files
June 27, 2024 Toward greater transparency: Unveiling Cloud Service CVEs
April 9, 2024 Toward greater transparency: Security Update Guide now shares CWEs for CVEs
January 6, 2023 Publishing CBL-Mariner CVEs on the Security Update Guide CVRF API
January 11, 2022 Coming Soon: New Security Update Guide Notification System
February 9, 2021 Continuing to Listen: Good News about the Security Update Guide API
January 13, 2021 Security Update Guide Supports CVEs Assigned by Industry Partners
December 8, 2020 Security Update Guide: Let’s keep the conversation going
November 9, 2020 Vulnerability Descriptions in the New Version of the Security Update Guide

Relevant Resources

• The new Hotpatching feature is now generally available. Please see Hotpatching feature for Windows Server Azure Edition virtual machines (VMs) for more information.
• Windows 10 and Windows 11 updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows 10 and Windows 11, in addition to non-security updates. The updates are available via the Microsoft Update Catalog. For information on lifecycle and support dates for Windows 10 and Windows 11 operating systems, please see Windows Lifecycle Facts Sheet.
• Microsoft is improving Windows Release Notes. For more information, please see What's next for Windows release notes.
• A list of the latest servicing stack updates for each operating system can be found in ADV990001. This list will be updated whenever a new servicing stack update is released. It is important to install the latest servicing stack update.
• In addition to security changes for the vulnerabilities, updates include defense-in-depth updates to help improve security-related features.
• Customers running Windows Server 2008 R2, or Windows Server 2008 need to purchase the Extended Security Update to continue receiving security updates. See 4522133 for more information.

Known Issues
You can see these in more detail from the Deployments tab by selecting Known Issues column in the Edit Columns panel.

For more information about Windows Known Issues, please see Windows message center (links to currently-supported versions of Windows are in the left pane).


KB Article Applies To
5120228 Windows Server 2025 Hotpatch
5120242 Windows Server 2022
5120233 Windows Server 2025
5121573 Exchange Server Subscription Edition RTM
5121574 Exchange Server 2019 CU15
5121575 Exchange Server 2019 CU14
5121576 Exchange Server 2016 CU23

Released: Aug 11, 2026

August 2026 Security Updates - Release Notes - Security Update Guide - Microsoft