MICROSOFT PATCH REPORTS  MAY

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

May 2026 Security Updates

This release consists of the following 161 Microsoft CVEs:

Tag CVE Base Score CVSS Vector Exploitability FAQs? Workarounds? Mitigations?
Windows Rich Text Edit CVE-2026-21530 6.7 CVSS:3.1/AV:L/AC:H/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 Power Pages CVE-2026-23652 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C N/A Yes No No
Azure Entra ID CVE-2026-23663 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 N/A Yes No No
M365 Copilot CVE-2026-26129 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 N/A Yes No No
Azure Compute Gallery CVE-2026-26147 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C N/A Yes No No
M365 Copilot CVE-2026-26164 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 Less Likely Yes No No
Windows Native WiFi Miniport Driver CVE-2026-32161 7.5 CVSS:3.1/AV:A/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
Windows Rich Text Edit Control CVE-2026-32170 6.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
.NET CVE-2026-32175 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C Exploitation Less Likely No No No
.NET CVE-2026-32177 7.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Microsoft Teams CVE-2026-32185 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
Azure Monitor Agent CVE-2026-32204 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
Azure Machine Learning CVE-2026-32207 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   Yes No No
Windows Filtering Platform (WFP) CVE-2026-32209 4.4 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Azure Managed Instance for Apache Cassandra CVE-2026-33109 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C N/A Yes No No
Microsoft Office SharePoint CVE-2026-33110 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 Less Likely Yes No No
Copilot Chat (Microsoft Edge) CVE-2026-33111 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 Less Likely Yes No No
Microsoft Office SharePoint CVE-2026-33112 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 Less Likely Yes No No
Azure SDK CVE-2026-33117 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Microsoft Dynamics 365 Customer Insights CVE-2026-33821 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N/E:U/RL:O/RC:C N/A Yes No No
Microsoft Teams CVE-2026-33823 9.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C N/A Yes No No
Azure Machine Learning CVE-2026-33833 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows Event Logging Service CVE-2026-33834 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 Cloud Files Mini Filter Driver CVE-2026-33835 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 TCP/IP CVE-2026-33837 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 Message Queuing CVE-2026-33838 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 Win32K - GRFX CVE-2026-33839 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
Windows Win32K - ICOMP CVE-2026-33840 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-2026-33841 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
Microsoft Azure Active Directory B2C CVE-2026-33843 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N N/A Yes No No
Azure Managed Instance for Apache Cassandra CVE-2026-33844 9.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C N/A Yes No No
Microsoft Partner Center CVE-2026-34327 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 Message Queuing CVE-2026-34329 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
Windows Win32K - GRFX CVE-2026-34330 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 Win32K - GRFX CVE-2026-34331 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
Windows Kernel-Mode Drivers CVE-2026-34332 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 Win32K - GRFX CVE-2026-34333 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 TCP/IP CVE-2026-34334 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 DWM Core Library CVE-2026-34336 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 Cloud Files Mini Filter Driver CVE-2026-34337 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 Telephony Service CVE-2026-34338 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 LDAP - Lightweight Directory Access Protocol CVE-2026-34339 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C Exploitation Less Likely No No No
Windows Projected File System CVE-2026-34340 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 Link-Layer Discovery Protocol (LLDP) CVE-2026-34341 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 Print Spooler Components CVE-2026-34342 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 Application Identity (AppID) Subsystem CVE-2026-34343 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-2026-34344 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-2026-34345 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 Win32K - GRFX CVE-2026-34347 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 Storport Miniport Driver CVE-2026-34350 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Windows TCP/IP CVE-2026-34351 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 Storage Spaces Controller CVE-2026-35415 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-2026-35416 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 Win32K - ICOMP CVE-2026-35417 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 Cloud Files Mini Filter Driver CVE-2026-35418 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 DWM Core Library CVE-2026-35419 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
Windows Kernel CVE-2026-35420 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 GDI CVE-2026-35421 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 Unlikely Yes No No
Windows TCP/IP CVE-2026-35422 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Telnet Client CVE-2026-35423 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Windows Internet Key Exchange (IKE) Protocol CVE-2026-35424 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
Azure Cloud Shell CVE-2026-35428 9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C N/A Yes No No
Microsoft Edge for Android CVE-2026-35429 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Exploitation Unlikely Yes No No
Azure Privileged Identity Management (PIM) CVE-2026-35430 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 N/A Yes No No
.NET CVE-2026-35433 7.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Azure AI Foundry M365 published agents CVE-2026-35435 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 Exploitation More Likely Yes No No
Microsoft Office Click-To-Run CVE-2026-35436 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
Windows Admin Center CVE-2026-35438 8.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Microsoft Office SharePoint CVE-2026-35439 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 Less Likely Yes No No
Microsoft Office Word CVE-2026-35440 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 SharePoint CVE-2026-40357 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 Less Likely Yes No No
Microsoft Office CVE-2026-40358 8.4 CVSS:3.1/AV:L/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
Microsoft Office Excel CVE-2026-40359 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 Excel CVE-2026-40360 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 Unlikely Yes No No
Microsoft Office CVE-2026-40361 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation More Likely Yes No No
Microsoft Office Excel CVE-2026-40362 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 CVE-2026-40363 8.4 CVSS:3.1/AV:L/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
Microsoft Office Word CVE-2026-40364 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation More Likely Yes No No
Microsoft Office SharePoint CVE-2026-40365 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 Less Likely Yes No No
Microsoft Office Word CVE-2026-40366 8.4 CVSS:3.1/AV:L/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
Microsoft Office Word CVE-2026-40367 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Microsoft Office SharePoint CVE-2026-40368 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 Kernel CVE-2026-40369 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
SQL Server CVE-2026-40370 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 Less Likely Yes No No
Power Automate CVE-2026-40374 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
Windows Cryptographic Services CVE-2026-40377 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
Azure Entra ID CVE-2026-40379 9.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C N/A Yes No No
Windows Volume Manager Extension Driver CVE-2026-40380 6.2 CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Azure Connected Machine Agent CVE-2026-40381 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 Telephony Service CVE-2026-40382 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 Common Log File System Driver CVE-2026-40397 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 Remote Desktop CVE-2026-40398 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 TCP/IP CVE-2026-40399 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 TCP/IP CVE-2026-40401 7.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Windows Hyper-V CVE-2026-40402 9.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows Win32K - GRFX CVE-2026-40403 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
Windows TCP/IP CVE-2026-40405 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
Windows TCP/IP CVE-2026-40406 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 Less Likely Yes No No
Windows Common Log File System Driver CVE-2026-40407 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 Kernel-Mode Drivers CVE-2026-40408 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 SMB Client CVE-2026-40410 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
Azure Virtual Network Gateway CVE-2026-40411 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C N/A Yes No No
Azure Orbital Spatio CVE-2026-40412 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C N/A Yes No No
Windows TCP/IP CVE-2026-40413 7.4 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Windows TCP/IP CVE-2026-40414 7.4 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Windows TCP/IP CVE-2026-40415 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 Unlikely Yes No No
Microsoft Edge (Chromium-based) CVE-2026-40416 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Dynamics Business Central CVE-2026-40417 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 Office Click-To-Run CVE-2026-40418 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
Microsoft Office CVE-2026-40419 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 Office Click-To-Run CVE-2026-40420 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
Microsoft Office Word CVE-2026-40421 4.3 CVSS:3.1/AV:N/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 Admin Center CVE-2026-41086 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 Less Likely Yes No No
Windows Ancillary Function Driver for WinSock CVE-2026-41088 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 Netlogon CVE-2026-41089 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
Microsoft Copilot CVE-2026-41090 9.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C N/A Yes No No
Microsoft Data Formulator CVE-2026-41094 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
Data Deduplication CVE-2026-41095 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 Windows DNS CVE-2026-41096 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 Unlikely Yes No No
Windows Secure Boot CVE-2026-41097 6.7 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
M365 Copilot CVE-2026-41100 4.4 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Microsoft Office Word CVE-2026-41101 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Microsoft Office PowerPoint CVE-2026-41102 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Microsoft SSO Plugin for Jira & Confluence CVE-2026-41103 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C Exploitation More Likely Yes No No
Microsoft Planetary Computer Pro CVE-2026-41104 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C N/A Yes No No
Azure Notification Service CVE-2026-41105 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C N/A Yes No No
Microsoft Edge (Chromium-based) CVE-2026-41107 7.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
GitHub Copilot and Visual Studio CVE-2026-41109 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
Visual Studio Code CVE-2026-41610 6.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Visual Studio Code CVE-2026-41611 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
Visual Studio Code CVE-2026-41612 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
Visual Studio Code CVE-2026-41613 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
M365 Copilot for Desktop CVE-2026-41614 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C Exploitation Less Likely No No No
Microsoft Authenticator CVE-2026-41615 9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Azure Local Disconnected Operations CVE-2026-42822 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation More Likely Yes No No
Azure Logic Apps CVE-2026-42823 9.9 CVSS:3.1/AV:N/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
Windows Telephony Service CVE-2026-42825 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
Azure DevOps CVE-2026-42826 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C N/A Yes No No
M365 Copilot CVE-2026-42827 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C N/A Yes No No
Azure Monitor Agent CVE-2026-42830 6.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Microsoft Office CVE-2026-42831 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 Unlikely Yes No No
Microsoft Office CVE-2026-42832 7.7 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
Microsoft Dynamics 365 (on-premises) CVE-2026-42833 9.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Azure Portal Windows Admin Center CVE-2026-42834 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 Edge (Chromium-based) CVE-2026-42838 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C Exploitation Less Likely Yes No No
Microsoft Edge (Chromium-based) CVE-2026-42891 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 Unlikely Yes No No
M365 Copilot CVE-2026-42893 7.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N/E:U/RL:O/RC:C Exploitation Less Likely No No No
Windows DWM Core Library CVE-2026-42896 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 Exchange Server CVE-2026-42897 8.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C Exploitation Detected Yes No No
Microsoft Dynamics 365 (on-premises) CVE-2026-42898 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C Exploitation Unlikely Yes No No
ASP.NET Core CVE-2026-42899 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
Microsoft Entra ID CVE-2026-42901 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C N/A Yes No No
Microsoft Edge (Chromium-based) CVE-2026-45492     Exploitation More Likely Yes No No
Microsoft Edge (Chromium-based) CVE-2026-45494 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C Exploitation More Likely Yes No No
Microsoft Edge (Chromium-based) CVE-2026-45495 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 More Likely Yes No No
Microsoft Defender CVE-2026-45498 4.0 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C Exploitation Detected Yes No No
Microsoft Defender CVE-2026-45584 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   Yes No No
Windows BitLocker CVE-2026-45585 6.8 CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:C Exploitation More Likely Yes No No
Microsoft Office SharePoint CVE-2026-45659 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 Less Likely Yes No No
Azure Resource Manager (ARM) CVE-2026-47280 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C   Yes No No
Microsoft Office SharePoint CVE-2026-47294 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

We are republishing 369 non-Microsoft CVEs (Chrome CVEs not listed):

CNA Tag CVE FAQs? Workarounds? Mitigations?
AMD AMD CPU Branch CVE-2025-54518 No 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
5087420 Windows 11, version 23H2
5087539 Windows Server 2025
5087541 Windows Server 2022 23H2
5087545 Windows Server 2022
5089549 Windows 11 version 25H2, Windows 11 version 24H2