MICROSOFT PATCH REPORTS  FEBRUARY

REPORTY 2026  January  February  March  April  May  June  July  August  September  October  November  December

February 2026 Security Updates

This release consists of the following 61 Microsoft CVEs:

Tag CVE Base Score CVSS Vector Exploitability FAQs? Workarounds? Mitigations?
Microsoft Edge (Chromium-based) CVE-2026-0102 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Microsoft Edge for Android CVE-2026-0391 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows Notepad App CVE-2026-20841 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows GDI+ CVE-2026-20846 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C Exploitation Less Likely No No No
.NET CVE-2026-21218 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Windows Kernel CVE-2026-21222 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Azure Local CVE-2026-21228 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Power BI CVE-2026-21229 8.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Windows Kernel CVE-2026-21231 7.8 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation More Likely Yes No No
Windows HTTP.sys CVE-2026-21232 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows Connected Devices Platform Service CVE-2026-21234 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Microsoft Graphics Component CVE-2026-21235 7.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows Ancillary Function Driver for WinSock CVE-2026-21236 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Windows Subsystem for Linux CVE-2026-21237 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows Ancillary Function Driver for WinSock CVE-2026-21238 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation More Likely Yes No No
Windows Kernel CVE-2026-21239 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows HTTP.sys CVE-2026-21240 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows Ancillary Function Driver for WinSock CVE-2026-21241 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation More Likely Yes No No
Windows Subsystem for Linux CVE-2026-21242 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows LDAP - Lightweight Directory Access Protocol CVE-2026-21243 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C Exploitation Unlikely No No No
Role: Windows Hyper-V CVE-2026-21244 7.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows Kernel CVE-2026-21245 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Microsoft Graphics Component CVE-2026-21246 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Role: Windows Hyper-V CVE-2026-21247 7.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Role: Windows Hyper-V CVE-2026-21248 7.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows NTLM CVE-2026-21249 3.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows HTTP.sys CVE-2026-21250 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Windows Cluster Client Failover CVE-2026-21251 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Mailslot File System CVE-2026-21253 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation More Likely Yes No No
Role: Windows Hyper-V CVE-2026-21255 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
GitHub Copilot and Visual Studio CVE-2026-21256 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
GitHub Copilot and Visual Studio CVE-2026-21257 8.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Microsoft Office Excel CVE-2026-21258 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Microsoft Office Excel CVE-2026-21259 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Microsoft Office Outlook CVE-2026-21260 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Microsoft Office Excel CVE-2026-21261 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows Storage CVE-2026-21508 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows Shell CVE-2026-21510 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C Exploitation Detected Yes No No
Microsoft Office Outlook CVE-2026-21511 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C Exploitation More Likely Yes No No
Azure DevOps Server CVE-2026-21512 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C Exploitation Less Likely No No No
MSHTML Framework CVE-2026-21513 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Detected Yes No No
Microsoft Office Word CVE-2026-21514 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C Exploitation Detected Yes No No
Github Copilot CVE-2026-21516 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows App for Mac CVE-2026-21517 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
GitHub Copilot and Visual Studio Code CVE-2026-21518 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Desktop Window Manager CVE-2026-21519 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Detected Yes No No
Azure Compute Gallery CVE-2026-21522 6.7 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Exploitation Less Likely Yes No No
GitHub Copilot and Visual Studio CVE-2026-21523 8.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows Remote Access Connection Manager CVE-2026-21525 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C Exploitation Detected No No No
Microsoft Exchange Server CVE-2026-21527 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Azure IoT Explorer CVE-2026-21528 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Azure HDInsights CVE-2026-21529 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Azure SDK CVE-2026-21531 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Azure Function CVE-2026-21532 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C N/A Yes No No
Windows Remote Desktop CVE-2026-21533 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C Exploitation Detected Yes No No
Microsoft Teams CVE-2026-21535 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Microsoft Defender for Linux CVE-2026-21537 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Azure Compute Gallery CVE-2026-23655 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Azure Front Door (AFD) CVE-2026-24300 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C N/A Yes No No
Azure Arc CVE-2026-24302 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C N/A Yes No No
Windows Admin Center CVE-2026-26119 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation More Likely Yes No No

We are republishing 19 non-Microsoft CVEs:

CNA Tag CVE FAQs? Workarounds? Mitigations?
Red Hat, Inc. Windows Win32K - GRFX CVE-2023-2804 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-1861 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-1862 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-2313 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-2314 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-2316 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-2317 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-2318 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-2319 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-2320 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-2322 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-2323 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-2441 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-2648 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-2649 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-2650 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-3061 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-3062 Yes No No
Chrome Microsoft Edge (Chromium-based) CVE-2026-3063 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

KB Article Product
5075942 Windows Server 2025 Hotpatch
5075897 Windows Server 23H2
5075899 Windows Server 2025
5075906 Windows Server 2022