JPCERT-AT-2026-0003
                                                             JPCERT/CC
                                                            2026-02-12

                 <<< JPCERT/CC Alert 2026-02-12 >>>

         Microsoft Releases February 2026 Security Updates

       https://www.jpcert.or.jp/english/at/2026/at260003.html


I. Overview
Microsoft has released February 2026 Security Updates to address the
vulnerabilities in their products. Attackers leveraging these vulnerabilities
may be able to gain SYSTEM privileges, among other impacts.

    Microsoft Corporation
    February 2026 Security Updates
    https://msrc.microsoft.com/update-guide/en-us/releaseNote/2026-Feb

According to Microsoft, among the vulnerabilities, the following
vulnerability has been confirmed to be exploited in the wild. Please
consider applying the security update programs by referring to
the information provided by Microsoft.

    CVE-2026-21510
    Windows Shell Security Feature Bypass Vulnerability
    https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-21510

    CVE-2026-21513
    MSHTML Framework Security Feature Bypass Vulnerability
    https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-21513

    CVE-2026-21514
    Microsoft Word Security Feature Bypass Vulnerability
    https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-21514

    CVE-2026-21519
    Desktop Window Manager Elevation of Privilege Vulnerability
    https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-21519

    CVE-2026-21525
    Windows Remote Access Connection Manager Denial of Service Vulnerability
    https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-21525

    CVE-2026-21533
    Windows Remote Desktop Services Elevation of Privilege Vulnerability
    https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-21533


II. Solution
Please apply the security update programs through Microsoft Update, Windows
Update, etc.

    Microsoft Update Catalog
    https://www.catalog.update.microsoft.com/

    Windows Update: FAQ
    https://support.microsoft.com/en-us/help/12373/windows-update-faq


III. References
    Microsoft Corporation
    Release Notes
    https://msrc.microsoft.com/update-guide/

If you have any information regarding this alert, please contact
JPCERT/CC.

======================================================================
JPCERT Coordination Center (Early Warning Group)
MAIL: ew-info@jpcert.or.jp
https://www.jpcert.or.jp/english/