JPCERT-AT-2026-0010
JPCERT/CC
2026-04-15

I. Overview

Microsoft has released April 2026 Security Updates to address the vulnerabilities in their products. Attackers leveraging these vulnerabilities may be able to perform spoofing over a network, or execute arbitrary code remotely without authentication, etc.

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

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-2026-32201
Microsoft SharePoint Server Spoofing Vulnerability
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-32201

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 (Cyber Security Coordination Group)
MAIL: ew-info@jpcert.or.jp
https://www.jpcert.or.jp/english/