Security Alert: Microsoft Releases April 2026 Security Updates

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/