※ 2026年02月の Microsoft Update 。(Windows 11 [25H2])
※ KB5077241 ( 累積更新 定例外 ) は放置。
※ 2026年02月の Microsoft Update 。(Office 2024 / Office 2021)
※ Version 2602 (Build 19725.20126) / 16.0.19725.20126 。
(関連)
https://msrc.microsoft.com/update-guide/releaseNote/2026-Feb
Security Update Guide - Microsoft Security Response Center
https://support.microsoft.com/en-us/help/5077239
February 24, 2026—KB5077239 (OS Build 28000.1643) Preview - Microsoft Support
https://support.microsoft.com/en-us/help/5077241
February 24, 2026—KB5077241 (OS Builds 26200.7922 and 26100.7922) Preview - Microsoft Support
https://support.microsoft.com/en-us/help/5075942
February 10, 2026—Hotpatch KB5075942 (OS Build 26100.32313) - Microsoft Support
https://support.microsoft.com/en-us/help/5047443
Release notes for Hotpatch on Windows Server 2025 Datacenter Azure Edition - Microsoft Support
https://support.microsoft.com/en-us/help/5075941
February 10, 2026—KB5075941 (OS Build 22631.6649) - Microsoft Support
https://support.microsoft.com/en-us/help/5075912
February 10, 2026—KB5075912 (OS Builds 19045.6937 and 19044.6937) - Microsoft Support
※ "February 10, 2026" 。
https://support.microsoft.com/en-us/help/5007651
Windows Security app update - Microsoft Support
https://support.microsoft.com/en-us/help/5068164
KB5068164: Windows Recovery Environment update for Windows 10, version 21H2 and 22H2: October 14, 2025 - Microsoft Support
※ Windows RE Update 。
https://support.microsoft.com/en-us/help/5001716
KB5001716: Update for Windows Update Service components - Microsoft Support
※ Windows Update Service Update 。 "July 2, 2025" 。
※ "Windows 11, version 21H2 Windows 10, version 22H2" 。
https://www.microsoft.com/en-us/msrc/blog/2026/02/202602-security-update
2026 年 2 月のセキュリティ更新プログラム (月例)
https://www.microsoft.com/en-us/msrc/blog/2025/11/securityupdatereleaseschedule2026
セキュリティ更新プログラム リリース スケジュール (2026 年)
https://devblogs.microsoft.com/dotnet/
.NET Blog
https://devblogs.microsoft.com/dotnet/dotnet-and-dotnet-framework-february-2026-servicing-updates/
.NET and .NET Framework February 2026 servicing releases updates - .NET Blog
https://learn.microsoft.com/en-us/dotnet/framework/release-notes/2026/02-10-february-cumulative-update
February 2026 cumulative update - .NET Framework | Microsoft Learn
https://devblogs.microsoft.com/dotnet/dotnet-11-preview-1/
.NET 11 Preview 1 is now available! - .NET Blog
https://devblogs.microsoft.com/dotnet/announcing-dotnet-10/
Announcing .NET 10 - .NET Blog
https://github.com/dotnet/core/blob/main/releases.md
core/releases.md at main · dotnet/core · GitHub
※ ".NET 10.0 November 11, 2025" の "Preview 10.0.2" まで。
https://github.com/dotnet/core/blob/main/release-notes/8.0/README.md
core/release-notes/8.0/README.md at main · dotnet/core · GitHub
https://github.com/dotnet/core/blob/main/release-notes/8.0/8.0.24/8.0.24.md
core/release-notes/8.0/8.0.24/8.0.24.md at main · dotnet/core · GitHub
https://github.com/dotnet/core/blob/main/release-notes/9.0/README.md
core/release-notes/9.0/README.md at main · dotnet/core · GitHub
https://github.com/dotnet/core/blob/main/release-notes/9.0/9.0.13/9.0.13.md
core/release-notes/9.0/9.0.13/9.0.13.md at main · dotnet/core · GitHub
https://github.com/dotnet/core/blob/main/release-notes/10.0/README.md
core/release-notes/10.0/README.md at main · dotnet/core · GitHub
https://github.com/dotnet/core/blob/main/release-notes/10.0/10.0.3/10.0.3.md
core/release-notes/10.0/10.0.3/10.0.3.md at main · dotnet/core · GitHub
https://support.microsoft.com/en-us/help/5077862
.NET 10.0 Update - February 10, 2026 - Microsoft Support
https://support.microsoft.com/en-us/help/5077864
.NET 9.0 Update - February 10, 2026 - Microsoft Support
https://support.microsoft.com/en-us/help/5077863
.NET 8.0 Update - February 10, 2026 - Microsoft Support
https://support.microsoft.com/en-us/help/5074828
January 29, 2026-KB5074828 Cumulative Update Preview for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2 - Microsoft Support
※ "January 29, 2026" 。 ( アーカイブ )
https://support.microsoft.com/en-us/help/5074831
https://support.microsoft.com/en-us/help/5074831
※ "January 29, 2026" 。 ( アーカイブ )
https://support.microsoft.com/en-us/help/5066131
October 14, 2025-KB5066131 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2 and Microsoft server operating system version 24H2 - Microsoft Support
※ "October 14, 2025" 。 ( アーカイブ )
https://support.microsoft.com/en-us/help/5066133
October 14, 2025-KB5066133 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 22H2 and Windows 11, version 23H2 - Microsoft Support
※ "October 14, 2025" 。
https://support.microsoft.com/en-us/help/5066747
October 14, 2025-KB5066747 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 10 Version 22H2 - Microsoft Support
※ "October 14, 2025" 。
https://learn.microsoft.com/en-us/officeupdates/update-history-office-2024
Update history for Office LTSC 2024 and Office 2024 - Office release notes | Microsoft Learn
※ "February 24, 2026 Version 2602 (Build 19725.20126)" 。 ( アーカイブ )
https://learn.microsoft.com/en-us/officeupdates/update-history-office-2021
Update history for Office LTSC 2021 and Office 2021 - Office release notes | Microsoft Learn
https://learn.microsoft.com/en-us/officeupdates/current-channel
Release notes for Current Channel releases - Office release notes | Microsoft Learn
https://support.microsoft.com/en-us/help/894199/
Description of Software Update Services and Windows Server Update Services changes in content for 2025 (KB894199) - Microsoft Support
https://learn.microsoft.com/en-us/DeployEdge/microsoft-edge-relnotes-security#february-20-2026
Release notes for Microsoft Edge Security Updates | Microsoft Learn
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21218
Security Update Guide - Microsoft Security Response Center
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21513
Security Update Guide - Microsoft Security Response Center
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21510
Security Update Guide - Microsoft Security Response Center
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21533
Security Update Guide - Microsoft Security Response Center
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525
Security Update Guide - Microsoft Security Response Center
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21519
Security Update Guide - Microsoft Security Response Center
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21514
Security Update Guide - Microsoft Security Response Center
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-2884
Security Update Guide - Microsoft Security Response Center
https://msrc.microsoft.com/update-guide/vulnerability/ADV990001
Security Update Guide - Microsoft Security Response Center
https://learn.microsoft.com/ja-jp/lifecycle/end-of-support/end-of-support-2026
2026 年のサポート終了 - Microsoft Lifecycle | Microsoft Learn
※ Office 2021 が秋 10月にサポート切れ。
https://blogs.windows.com/windows-insider/
Home | Windows Insider Blog
https://learn.microsoft.com/en-us/windows/release-health/windows-message-center#3747
Windows message center | Microsoft Learn
https://learn.microsoft.com/en-us/windows/release-health/windows-message-center#3789
Windows message center | Microsoft Learn
https://learn.microsoft.com/en-us/windows/release-health/windows-message-center#3787
Windows message center | Microsoft Learn
https://learn.microsoft.com/en-us/windows/release-health/windows-message-center#3790
Windows message center | Microsoft Learn
https://learn.microsoft.com/en-us/windows/release-health/windows-message-center#3788
Windows message center | Microsoft Learn
https://learn.microsoft.com/en-us/windows/release-health/status-windows-11-26h2
https://learn.microsoft.com/en-us/windows/release-health/status-windows-11-26h2
https://learn.microsoft.com/en-us/windows/release-health/status-windows-11-25h2
Windows 11, version 25H2 known issues and notifications | Microsoft Learn
https://learn.microsoft.com/en-us/windows/release-health/status-windows-11-24h2
Windows 11, version 24H2 known issues and notifications | Microsoft Learn
https://learn.microsoft.com/en-us/windows/release-health/status-windows-11-23h2
Windows 11, version 23H2 known issues and notifications | Microsoft Learn
・・・
https://www.microsoft.com/ja-jp/software-download/windows11
Windows 11 のダウンロード
※ Windows11InstallationAssistant.exe と MediaCreationTool.exe 。
※ Win11_25H2_Japanese_x64.iso のダウンロードリンクは 24 時間有効。
https://support.microsoft.com/en-us/windows/create-installation-media-for-windows-99a58364-8c02-206f-aa6f-40c3b507420d#id0ejd=windows_11
Create installation media for Windows - Microsoft Support
・・・
https://www.st.ryukoku.ac.jp/~kjm/security/memo/2026/02.html#20260213_microsoft
セキュリティホール memo
※ 予定。
https://www.jpcert.or.jp/at/2026/at260003.html
2026年2月マイクロソフトセキュリティ更新プログラムに関する注意喚起
https://www.ipa.go.jp/security/security-alert/2025/0212-ms.html
Microsoft 製品の脆弱性対策について(2026年2月) | 情報セキュリティ | IPA 独立行政法人 情報処理推進機構
https://www.ipa.go.jp/security/security-alert/2024/win10_eos.html
Windows 10 のサポート終了に伴う注意喚起 | 情報セキュリティ | IPA 独立行政法人 情報処理推進機構
https://jvn.jp/vu/JVNVU93387839/
JVNVU#93387839: Intel製品に複数の脆弱性（2026年2月）
https://jprs.jp/tech/security/2025-03-17-windows.html
Windowsドメインネームサービスの脆弱性情報が公開されました（CVE-2025-24064）
https://isc.sans.edu/diary/Microsoft+Patch+Tuesday+February+2026/32700/
Microsoft Patch Tuesday - February 2026 - SANS ISC
https://forest.watch.impress.co.jp/docs/news/2088331.html
Windows 11の2026年2月プレビューパッチが公開 ～Emoji 16.0、タスクバーからネット速度計測、Sysmon同梱 - 窓の杜
※ "2026年2月25日" 付け。
https://forest.watch.impress.co.jp/docs/news/2087999.html
Microsoft、サポート終了間近の「Windows Server 2016」など3製品に「ESU」を提供 - 窓の杜
※ "2026年2月24日" 付け。
https://www.nichepcgamer.com/archives/windows11-windows-update-preview-2026-2-kb5077241.html
【Windows11】 WindowsUpdate 2026年2月 不具合情報 - プレビューリリース KB5077241 ［Update 2］ | ニッチなPCゲーマーの環境構築Z
https://www.nichepcgamer.com/archives/outlook-mouse-cursor-and-pointer-disappears-issue.html
マウスカーソル・マウスポインターが消える不具合。Outlook (classic)にて発生。頻度は低いものの他のMicrosoft 365アプリでも発生 | ニッチなPCゲーマーの環境構築Z
https://www.nichepcgamer.com/archives/windows11-ip-notepad-image-button-preview.html
MS、Windows11の『メモ帳』に画像挿入機能を追加予定。どんどんワードパッド化していく | ニッチなPCゲーマーの環境構築Z
・・・
https://tsusuzuki.hatenadiary.jp/entry/2026/02/18/230000
2026年02月の Microsoft Update (定例外) 2026-02-18 - 取締役 平社員 ブログ (ベータ版)
https://tsusuzuki.hatenadiary.jp/entry/2026/02/14/230000
2026年02月の Microsoft Update (定例) 2026-02-11 - 取締役 平社員 ブログ (ベータ版)
https://tsusuzuki.hatenadiary.jp/entry/2026/01/30/230000
2026年01月の Microsoft Update (定例外) 2026-01-25 / 2026-01-30 - 取締役 平社員 ブログ (ベータ版)
https://tsusuzuki.hatenadiary.jp/entry/2026/01/21/233000
2026年01月の Microsoft Update (定例外) 2026-01-21 - 取締役 平社員 ブログ (ベータ版)
https://tsusuzuki.hatenadiary.jp/entry/2026/01/19/230000
2026年01月の Microsoft Update (定例) 2026-01-14 / 2026-01-18 - 取締役 平社員 ブログ (ベータ版)
いじょうです。
