Microsoftは11月10日(現地時間)、毎月米国時間の第2火曜日に提供している月例更新の一環として、Windows 11 Version 26H2/25H2/24H2用の累積アップデートKB5132061をリリースしました。更新プログラムは主にシステムの品質を改善し、セキュリティ問題を修正するものです。自動的にインストールされますが、Windows UpdateまたはMicrosoft Update Catalogを利用して手動でインストールすることもできます。それぞれの変更点は以下の通りです(キュリティアップデートの内容は日本Microsoftのブログで参照できます)。November 10, 2026—KB5132061 (OS Builds 26300.9974, 26200.9974 and 26100.9974)Windows 11 Version 24H2用の更新プログラムKB5132061では、セキュリティ脆弱性への修正を実施され、セキュアブート証明書の自動展開対象デバイスが拡大されています。USB Audio 1.0 デバイスが「コード10」で起動しない問題の修正や、Active Directory経由で公開されたプリンター追加時に「エラー87」が発生する問題の修正、リモートデスクトップ(RDP)の証明書不一致による接続失敗の問題の修正も行われています。改良と修正[Security updates] This update provides security improvements. For more information about the security vulnerabilities resolved by this update, see the Security Update Guide.[Secure Boot] This update includes additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Certificate deployment via Windows updates continues across supported PCs and non-managed business devices in the coming months.[Audio (known issue)] FixedUSB Audio 1.0 devices might fail to start and display error code 10 in Device Manager after installing a recent security update.This update fixes an issue where HDMI and DisplayPort audio playback might fail on certain AMD graphics cards.[Printing] Fixed: Adding a printer published in Active Directory through Settings > Bluetooth & devices > Printers & scanners > Add device might fail with error 87, “The parameter is incorrect.” This issue was introduced by the October 2026 update and does not generally affect existing printers or printing.[Security] This update improves NTLM security by enabling clients to offer NTLM message signing by default for non-anonymous connections. This change helps reduce exposure to NTLM relay attacks and provides auditing to identify connections that are not using signing. To learn more, see NTLM signing security improvements in Windows.[Date and Time] This update adjusts daylight saving time (DST) rules for Cuba for the extended 2026-2027 DST period. Cuba remains on UTC-04:00 and doesn't observe the November 2026 and March 2027 transitions. It returns to UTC-05:00 in November 2027 and resumes its regular seasonal schedule in 2028.For the latest DST and time zone guidance, see the Daylight Saving Time & Time Zone Blog.[Remote Desktop] This update addresses an issue where Remote Desktop Protocol (RDP) connections might fail on the client due to a certificate mismatch after the October 2026 non-security preview update.[Windows PowerShell] This update strengthens security for PowerShell script signing and signature verification by introducing stricter encoding validation. As a result, scripts containing invalid UTF-8 encoding might fail signature validation, even if they were previously accepted. To resolve this issue, review the affected scripts, save them using valid UTF-8 encoding with a byte order mark (BOM), and sign them again. For further guidance, see Encoding Guidance for Signed PowerShell Scripts.既知の不具合更新プログラムには既知の不具合は存在しません。更新プログラムはWindows Updateの他、Microsoft Update Catalog、Windows Server Update Services(WSUS)を利用してインストールすることができます。