Windows Defender のセキュリティ更新プログラム (2026 年 4 月)

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バージョン 1.5 Apr 27, 2026, 11:43 AM CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:H/RL:OF/RC:C") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:H/RL:O/RC:C") Exploit attributes ("Exploited by malware" set to "True") Plugin Feed: 202604271143
バージョン 1.4 Apr 23, 2026, 4:31 AM CISA reference Plugin Feed: 202604230431
バージョン 1.3 Apr 20, 2026, 10:26 PM CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:F/RL:OF/RC:C") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:F/RL:O/RC:C") Exploit attributes ("Exploit framework core" set to "True") Plugin Feed: 202604202226
バージョン 1.2 Apr 17, 2026, 9:54 AM CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:POC/RL:OF/RC:C") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:P/RL:O/RC:C") Exploit attributes ("Exploit available" set to "True") Exploit attributes ("Exploitability ease" set to "Exploits are available") Plugin Feed: 202604170954
バージョン 1.1 Apr 16, 2026, 7:20 PM New Plugin Feed: 202604161920

* Changelogs are generally available for changes made after Nov 1, 2022