{"id":15313,"date":"2026-03-11T03:01:10","date_gmt":"2026-03-10T18:01:10","guid":{"rendered":"https:\/\/m365jp.net\/?p=15313"},"modified":"2026-03-11T03:02:42","modified_gmt":"2026-03-10T18:02:42","slug":"mc1248239-the-march-2026-windows-security-update-is-now-available","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-03-11-mc1248239-the-march-2026-windows-security-update-is-now-available","title":{"rendered":"MC1248239 | The March 2026 Windows security update is now available"},"content":{"rendered":"<div class=\"postie-post\">\n<div>\n<hr>\n<table id=\"section\">\n<tbody>\n<tr>\n<th width=\"95%\">MC1248239 | The March 2026 Windows security update is now available<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr>\n<table id=\"data\">\n<tbody>\n<tr>\n<th>Classification<\/th>\n<td>stayInformed<\/td>\n<\/tr>\n<tr>\n<th>Last Updated<\/th>\n<td>03\/10\/2026 17:09:18<\/td>\n<\/tr>\n<tr>\n<th>Start Time<\/th>\n<td>03\/10\/2026 17:09:17<\/td>\n<\/tr>\n<tr>\n<th>End Time<\/th>\n<td>03\/10\/2027 17:09:17<\/td>\n<\/tr>\n<tr>\n<th>Message Content<\/th>\n<td>\n<div>The March 2026 security update is now available for all supported versions of Windows. We recommend that you install these updates promptly. For more information about the contents of this update, see the release notes, which are easily accessible from   the&nbsp;<a href=\"https:\/\/support.microsoft.com\/help\/5079473\" rel=\"noopener noreferrer\" target=\"_blank\">Windows 11<\/a> update history page. To learn more about the different types of monthly quality updates, see  <a href=\"https:\/\/aka.ms\/Windows\/MonthlyUpdates\" rel=\"noopener noreferrer\" target=\"_blank\">  Windows monthly updates explained<\/a>.<\/div>\n<div>&nbsp;&nbsp;<\/div>\n<div><b>Highlights for the Windows 11, version 25H2 update:&nbsp;<\/b><\/div>\n<ul>\n<li>This security update includes improvements that were a part of update&nbsp;<a href=\"https:\/\/support.microsoft.com\/help\/5077181\" rel=\"noopener noreferrer\" target=\"_blank\">KB5077181<\/a> (released February 10, 2026).<\/li>\n<li>This update makes quality improvements to the servicing stack, which is the component that installs Windows updates.<\/li>\n<li>This update adds high\u2011confidence device targeting, expanding coverage for automatic Secure Boot certificate delivery.<\/li>\n<li>This update improves File Explorer search reliability&nbsp;when searching across multiple drives or &#8220;This PC&#8221;.&nbsp;<\/li>\n<li>This update improves the reliability of choosing trusted catalog files. It adds a warning dialog that helps you confirm that the file you select comes from a trusted source. \u200b\u200b\u200b\u200b\u200b\u200b\u200b<\/li>\n<\/ul>\n<div>  <\/div>\n<div>Short on time? Watch our <a href=\"https:\/\/aka.ms\/Windows11\/ReleaseNotes\/Video\/2603\" rel=\"noopener noreferrer\" target=\"_blank\">  Windows 11 release notes video<\/a> for this month&#8217;s tips.<\/div>\n<div>  <\/div>\n<div>For instructions on how to install this update, see the KB for your operating system listed below:&nbsp;<\/div>\n<ul>\n<li>Windows 11, version 26H1: <a href=\"https:\/\/support.microsoft.com\/help\/5079466\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5079466<\/a><\/li>\n<li>Windows 11, versions 25H2 and 24H2: <a href=\"https:\/\/support.microsoft.com\/help\/5079473\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5079473<\/a><\/li>\n<li>Windows 11, version 23H2: <a href=\"https:\/\/support.microsoft.com\/help\/5078883\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078883<\/a><\/li>\n<li>Windows 11 Enterprise LTSC 2024: Hotpatch <a href=\"https:\/\/support.microsoft.com\/topic\/752485e9-41c1-4628-ad1a-7538dba503e3\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5079420<\/a><\/li>\n<li>Windows 10, versions 22H2 and 21H2: <a href=\"https:\/\/support.microsoft.com\/help\/5078885\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078885<\/a><\/li>\n<li>Windows 10 Enterprise LTSC 2019 and Windows Server 2019: <a href=\"https:\/\/support.microsoft.com\/help\/5078752\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078752<\/a><\/li>\n<li>Windows 10 LTSB 2016 and Windows Server 2016: <a href=\"https:\/\/support.microsoft.com\/help\/5078938\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078938<\/a><\/li>\n<li>Windows Server 2025: <a href=\"https:\/\/support.microsoft.com\/help\/5078740\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078740<\/a><\/li>\n<li>Windows Server 2025 Datacenter: Azure Edition: Hotpatch <a href=\"https:\/\/support.microsoft.com\/topic\/d62230e0-d4fb-4597-8df4-81410e827f79\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078736<\/a><\/li>\n<li>Windows Server 2022: <a href=\"https:\/\/support.microsoft.com\/help\/5078766\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078766<\/a><\/li>\n<li>Windows Server 2022 Datacenter: Azure Edition: Hotpatch <a href=\"https:\/\/support.microsoft.com\/topic\/c3e0f4b0-62ac-4f92-9a7c-1831d02dc155\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078737<\/a><\/li>\n<li>Windows Server 2012 R2: <a href=\"https:\/\/support.microsoft.com\/help\/5078774\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078774<\/a><\/li>\n<li>Windows Server 2012: <a href=\"https:\/\/support.microsoft.com\/help\/5078775\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078775<\/a><\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<th>Machine Translation<\/th>\n<td>\n<div>2026\u5e743\u6708\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306f\u3001\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u305f\u3059\u3079\u3066\u306eWindows\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u5229\u7528\u53ef\u80fd\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u3053\u308c\u3089\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306f\u901f\u3084\u304b\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u3053\u3068\u3092\u63a8\u5968\u3057\u307e\u3059\u3002\u3053\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306e\u5185\u5bb9\u306b\u3064\u3044\u3066\u306e\u8a73\u7d30\u306f\u3001<a href=\"https:\/\/support.microsoft.com\/help\/5079473\" rel=\"noopener noreferrer\" target=\"_blank\">Windows 11<\/a> \u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u5c65\u6b74\u30da\u30fc\u30b8\u304b\u3089&nbsp;\u7c21\u5358\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u30ea\u30ea\u30fc\u30b9\u30ce\u30fc\u30c8\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002\u6708\u6b21\u54c1\u8cea\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306e\u7a2e\u985e\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u65b9\u306f\u3001  <a href=\"https:\/\/aka.ms\/Windows\/MonthlyUpdates\" rel=\"noopener noreferrer\" target=\"_blank\">  Windows\u6708\u6b21\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306e\u8aac\u660e<\/a>\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/div>\n<div>&nbsp;&nbsp;<\/div>\n<div><b>Windows 11 \u30d0\u30fc\u30b8\u30e7\u30f325H2\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306e\u30cf\u30a4\u30e9\u30a4\u30c8:&nbsp;<\/b><\/div>\n<ul>\n<li>\u3053\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306b\u306f\u30012026\u5e742\u670810\u65e5\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u305f\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8&nbsp;<a href=\"https:\/\/support.microsoft.com\/help\/5077181\" rel=\"noopener noreferrer\" target=\"_blank\">KB5077181<\/a> \u306e\u4e00\u90e8\u3067\u3042\u3063\u305f\u6539\u5584\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002<\/li>\n<li>\u3053\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306f\u3001Windows\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u3042\u308b\u30b5\u30fc\u30d3\u30b9\u30b9\u30bf\u30c3\u30af\u306e\u54c1\u8cea\u3092\u6539\u5584\u3057\u307e\u3059\u3002<\/li>\n<li>\u3053\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3067\u306f\u3001\u9ad8\u4fe1\u983c\u5ea6\u30c7\u30d0\u30a4\u30b9\u30bf\u30fc\u30b2\u30c6\u30a3\u30f3\u30b0\u304c\u8ffd\u52a0\u3055\u308c\u3001\u81ea\u52d5\u30bb\u30ad\u30e5\u30a2\u30d6\u30fc\u30c8\u8a3c\u660e\u66f8\u914d\u4fe1\u306e\u30ab\u30d0\u30ec\u30c3\u30b8\u304c\u62e1\u5927\u3055\u308c\u307e\u3059\u3002<\/li>\n<li>\u3053\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306b\u3088\u308a\u3001\u8907\u6570\u306e\u30c9\u30e9\u30a4\u30d6\u3084\u300c\u3053\u306ePC\u300d\u3092\u307e\u305f\u3050\u691c\u7d22\u6642\u306e\u30d5\u30a1\u30a4\u30eb\u30a8\u30af\u30b9\u30d7\u30ed\u30fc\u30e9\u30fc\u691c\u7d22\u306e\u4fe1\u983c\u6027&nbsp;\u304c\u5411\u4e0a\u3057\u307e\u3057\u305f\u3002&nbsp;<\/li>\n<li>\u3053\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306b\u3088\u308a\u3001\u4fe1\u983c\u3067\u304d\u308b\u30ab\u30bf\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u9078\u629e\u306e\u4fe1\u983c\u6027\u304c\u5411\u4e0a\u3057\u307e\u3057\u305f\u3002\u9078\u629e\u3057\u305f\u30d5\u30a1\u30a4\u30eb\u304c\u4fe1\u983c\u3067\u304d\u308b\u30bd\u30fc\u30b9\u304b\u3089\u306e\u3082\u306e\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306e\u8b66\u544a\u30c0\u30a4\u30a2\u30ed\u30b0\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002???????<\/li>\n<\/ul>\n<div>  <\/div>\n<div>\u6642\u9593\u304c\u306a\u3044?\u4eca\u6708\u306e\u30d2\u30f3\u30c8\u306f <a href=\"https:\/\/aka.ms\/Windows11\/ReleaseNotes\/Video\/2603\" rel=\"noopener noreferrer\" target=\"_blank\">  Windows 11\u30ea\u30ea\u30fc\u30b9\u30ce\u30fc\u30c8\u306e\u52d5\u753b<\/a> \u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/div>\n<div>  <\/div>\n<div>\u3053\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u3001\u4ee5\u4e0b\u306e\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u306e\u77e5\u8b58\u5eab(KB)\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002&nbsp;<\/div>\n<ul>\n<li>Windows 11\u3001\u30d0\u30fc\u30b8\u30e7\u30f326H1: <a href=\"https:\/\/support.microsoft.com\/help\/5079466\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5079466<\/a><\/li>\n<li>Windows 11\u3001\u30d0\u30fc\u30b8\u30e7\u30f325H2\u304a\u3088\u307324H2: <a href=\"https:\/\/support.microsoft.com\/help\/5079473\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5079473<\/a><\/li>\n<li>Windows 11\u3001\u30d0\u30fc\u30b8\u30e7\u30f323H2: <a href=\"https:\/\/support.microsoft.com\/help\/5078883\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078883<\/a><\/li>\n<li>Windows 11 Enterprise LTSC 2024:\u30db\u30c3\u30c8\u30d1\u30c3\u30c1 <a href=\"https:\/\/support.microsoft.com\/topic\/752485e9-41c1-4628-ad1a-7538dba503e3\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5079420<\/a><\/li>\n<li>Windows 10\u3001\u30d0\u30fc\u30b8\u30e7\u30f322H2\u304a\u3088\u307321H2: <a href=\"https:\/\/support.microsoft.com\/help\/5078885\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078885<\/a><\/li>\n<li>Windows 10 Enterprise LTSC 2019 \u3068 Windows Server 2019: <a href=\"https:\/\/support.microsoft.com\/help\/5078752\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078752<\/a><\/li>\n<li>Windows 10 LTSB 2016\u304a\u3088\u3073Windows Server 2016: <a href=\"https:\/\/support.microsoft.com\/help\/5078938\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078938<\/a><\/li>\n<li>Windows Server 2025: <a href=\"https:\/\/support.microsoft.com\/help\/5078740\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078740<\/a><\/li>\n<li>Windows Server 2025 Datacenter: Azure Edition: Hotpatch <a href=\"https:\/\/support.microsoft.com\/topic\/d62230e0-d4fb-4597-8df4-81410e827f79\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078736<\/a><\/li>\n<li>Windows Server 2022: <a href=\"https:\/\/support.microsoft.com\/help\/5078766\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078766<\/a><\/li>\n<li>Windows Server 2022 Datacenter: Azure Edition: Hotpatch <a href=\"https:\/\/support.microsoft.com\/topic\/c3e0f4b0-62ac-4f92-9a7c-1831d02dc155\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078737<\/a><\/li>\n<li>Windows Server 2012 R2: <a href=\"https:\/\/support.microsoft.com\/help\/5078774\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078774<\/a><\/li>\n<li>Windows Server 2012: <a href=\"https:\/\/support.microsoft.com\/help\/5078775\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5078775<\/a><\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>MC1248239 | The March 2026 Windows security update is now available Classification stayInformed Last Updated 0 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-15313","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15313","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/comments?post=15313"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15313\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=15313"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=15313"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=15313"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}