Description:
Microsoft has released security updates addressing multiple vulnerabilities which affect several Microsoft products or components. The list of security updates can be found at:
https://msrc.microsoft.com/update-guide/releaseNote/2026-Feb
Reports indicated that multiple vulnerabilities (CVE-2026-21510, CVE-2026-21513, CVE-2026-21514, CVE-2026-21519, CVE-2026-21525 and CVE-2026-21533) are being exploited in the wild and indicated that proof-of-concept (PoC) exploit code is available for a denial of service vulnerability (CVE-2023-2804). System administrators are advised to take immediate action to patch your affected systems to mitigate the elevated risk of cyber attacks.
Affected Systems:
- Microsoft Windows 10, 11
- Microsoft Windows Server 2008, 2008 R2, 2012, 2012 R2, 2016, 2019, 2022, 2022 23H2 Edition, 2025
- Microsoft Office 2016, 2019, LTSC 2021, LTSC 2024, LTSC for Mac 2021, LTSC for Mac 2024
- Office Online Server
- Microsoft Word 2016
- Microsoft Outlook 2016
- Microsoft 365 Apps for Enterprise
- Microsoft Exchange Server 2016, 2019, Subscription Edition RTM
- Microsoft SharePoint Enterprise Server 2016
- Microsoft SharePoint Server 2019, Server Subscription Edition
- Microsoft Visual Studio 2022
- Microsoft Visual Studio Code
- .NET 8.0 installed on Linux, 8.0 installed on Mac OS, 8.0 installed on Windows, 9.0 installed on Linux, 9.0 installed on Mac OS, 9.0 installed on Windows, 10.0 installed on Linux, 10.0 installed on Mac OS, 10.0 installed on Windows
- Microsoft ACI Confidential Containers
- Microsoft Defender
- Microsoft Windows App for Mac
- Microsoft Windows Notepad
- GitHub Copilot Plugin
- Power BI Report Server
For detailed information of the affected products, please refer to the section ‘Affected Products’ of corresponding security advisory at vendor's website.
Impact:
Depending on the vulnerabilities exploited, a successful attack could lead to remote code execution, denial of service, elevation of privilege, information disclosure, security restriction bypass or spoofing on an affected system.
Recommendation:
Patches for affected products are available from the Windows Update / Microsoft Update Catalog. Users of affected systems should follow the recommendations provided by the product vendor and take immediate actions to mitigate the risk.
More Information:
- https://msrc.microsoft.com/update-guide/releaseNote/2026-Feb
- https://www.hkcert.org/security-bulletin/microsoft-monthly-security-update-february-2026
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2804
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20841
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20846
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21218
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21222
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21229
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21231 (to CVE-2026-21232)
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21234 (to CVE-2026-21251)
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21253
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21255 (to CVE-2026-21261)
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21508
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21510 (to CVE-2026-21511)
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21513 (to CVE-2026-21514)
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21516 (to CVE-2026-21519)
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21523
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21525
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21527
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21533
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21537
