{"id":14498,"date":"2026-01-14T08:01:31","date_gmt":"2026-01-13T23:01:31","guid":{"rendered":"https:\/\/m365jp.net\/?p=14498"},"modified":"2026-01-14T08:06:30","modified_gmt":"2026-01-13T23:06:30","slug":"mc1217507-the-january-2026-windows-security-update-is-now-available-2","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-01-14-mc1217507-the-january-2026-windows-security-update-is-now-available-2","title":{"rendered":"MC1217507 | The January 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%\">MC1217507 | The January 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>01\/13\/2026 22:06:24<\/td>\n<\/tr>\n<tr>\n<th>Start Time<\/th>\n<td>01\/13\/2026 22:06:22<\/td>\n<\/tr>\n<tr>\n<th>End Time<\/th>\n<td>01\/13\/2027 22:06:22<\/td>\n<\/tr>\n<tr>\n<th>Message Content<\/th>\n<td>\n<div>The January 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\/5074109\" 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\/5072033\" rel=\"noopener noreferrer\" target=\"_blank\">KB5072033<\/a> (released December 9, 2025).<\/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 addresses an issue where you might experience&nbsp;<a href=\"https:\/\/learn.microsoft.com\/azure\/virtual-desktop\/publish-applications-stream-remoteapp?tabs=portal\" rel=\"noopener noreferrer\" target=\"_blank\">RemoteApp<\/a>&nbsp;\u200b\u200b\u200b\u200b\u200b\u200b\u200bconnection failures in   Azure Virtual Desktop environments. This might occur after installing&nbsp;<a href=\"https:\/\/support.microsoft.com\/help\/5070311\" rel=\"noopener noreferrer\" target=\"_blank\">KB5070311<\/a>.<\/li>\n<li>This update addresses an issue where devices with a Neural Processing Unit (NPU) might stay powered on when idle.<\/li>\n<\/ul>\n<div>  <\/div>\n<div>Short on time? Watch our <a href=\"https:\/\/aka.ms\/Windows11\/ReleaseNotesVideo\/2601\" rel=\"noopener noreferrer\" target=\"_blank\">  Windows 11 release notes video<\/a> for this month&#8217;s tips.<\/div>\n<div>  <\/div>\n<div><b>Note:<\/b> Starting with the January 2026 security update, Windows Server 2025 will have its own KB identifiers and build numbers, separate from Windows 11, versions 24H2 and 25H2. This change improves clarity for administrators. Installation and management   processes remain the same.<\/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, versions 25H2 and 24H2: <a href=\"https:\/\/support.microsoft.com\/help\/5074109\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5074109<\/a><\/li>\n<li>Windows 11, version 23H2: <a href=\"https:\/\/support.microsoft.com\/help\/5073455\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073455<\/a><\/li>\n<li>Windows 11 Enterprise LTSC 2024: Hotpatch <a href=\"https:\/\/support.microsoft.com\/topic\/237710ab-0834-4fdc-a253-9f67c1f069a7\" rel=\"noopener noreferrer\" target=\"_blank\">  Baseline<\/a><\/li>\n<li>Windows 10, versions 22H2 and 21H2: <a href=\"https:\/\/support.microsoft.com\/help\/5073724\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073724<\/a><\/li>\n<li>Windows 10 Enterprise LTSC 2019 and Windows Server 2019: <a href=\"https:\/\/support.microsoft.com\/help\/5073723\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073723<\/a><\/li>\n<li>Windows 10 LTSB 2016 and Windows Server 2016: <a href=\"https:\/\/support.microsoft.com\/help\/5073722\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073722<\/a><\/li>\n<li>Windows Server 2025: <a href=\"https:\/\/support.microsoft.com\/help\/5073379\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073379<\/a><\/li>\n<li>Windows Server 2025 Datacenter: Azure Edition: Hotpatch <a href=\"https:\/\/support.microsoft.com\/topic\/07d1ed4c-f570-492e-a8e0-ab807a5bc296\" rel=\"noopener noreferrer\" target=\"_blank\">  Baseline<\/a><\/li>\n<li>Windows Server 2022: <a href=\"https:\/\/support.microsoft.com\/help\/5073457\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073457<\/a><\/li>\n<li>Windows Server 2022 Datacenter: Azure Edition: Hotpatch <a href=\"https:\/\/support.microsoft.com\/topic\/1be577b2-9a83-4eb7-9840-289ce599f40e\" rel=\"noopener noreferrer\" target=\"_blank\">  Baseline<\/a><\/li>\n<li>Windows Server 2012 R2: Monthly Rollup: <a href=\"https:\/\/support.microsoft.com\/help\/5073696\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073696<\/a><\/li>\n<li>Windows Server 2012: Monthly Rollup: <a href=\"https:\/\/support.microsoft.com\/help\/5073698\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073698<\/a><\/li>\n<li>Windows Server 2008 R2 Service Pack 1: Monthly Rollup: <a href=\"https:\/\/support.microsoft.com\/help\/5073695\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073695<\/a>&nbsp;\/ Security Only: <a href=\"https:\/\/support.microsoft.com\/help\/5073699\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073699<\/a><\/li>\n<li>Windows Server 2008 SP2: Monthly Rollup: <a href=\"https:\/\/support.microsoft.com\/help\/5073697\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073697<\/a> \/ Security Only: <a href=\"https:\/\/support.microsoft.com\/help\/5073700\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073700<\/a><\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<th>Machine Translation<\/th>\n<td>\n<div>2026\u5e741\u6708\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306f\u3001\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u308b\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\/5074109\" 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\u30012025\u5e7412\u67089\u65e5\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u305f\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8&nbsp;<a href=\"https:\/\/support.microsoft.com\/help\/5072033\" rel=\"noopener noreferrer\" target=\"_blank\">KB5072033<\/a> \u306e\u4e00\u90e8\u3060\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\u306f\u3001<a href=\"https:\/\/learn.microsoft.com\/azure\/virtual-desktop\/publish-applications-stream-remoteapp?tabs=portal\" rel=\"noopener noreferrer\" target=\"_blank\">RemoteApp<\/a>&nbsp;???????\u3067\u767a\u751f\u3059\u308b&nbsp;\u53ef\u80fd\u6027\u306e\u3042\u308b\u554f\u984c\u306b\u5bfe\u5fdc\u3057\u307e\u3059Azure Virtual Desktop\u74b0\u5883\u306b\u304a\u3051\u308b\u63a5\u7d9a\u969c\u5bb3\u3002\u3053\u308c\u306f<a href=\"https:\/\/support.microsoft.com\/help\/5070311\" rel=\"noopener noreferrer\" target=\"_blank\">KB5070311<\/a>\u3092\u8a2d\u7f6e&nbsp;\u3057\u305f\u5f8c\u306b\u8d77\u3053\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li>\u3053\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306f\u3001\u30cb\u30e5\u30fc\u30e9\u30eb\u51e6\u7406\u30e6\u30cb\u30c3\u30c8(NPU)\u3092\u642d\u8f09\u3057\u305f\u30c7\u30d0\u30a4\u30b9\u304c\u30a2\u30a4\u30c9\u30eb\u72b6\u614b\u3067\u3082\u96fb\u6e90\u304c\u30aa\u30f3\u306b\u306a\u308a\u7d9a\u3051\u308b\u554f\u984c\u306b\u5bfe\u5fdc\u3057\u3066\u3044\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\/ReleaseNotesVideo\/2601\" 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><b>\u6ce8:<\/b> 2026\u5e741\u6708\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u304b\u3089\u3001Windows Server 2025\u306fWindows 11\u306e\u30d0\u30fc\u30b8\u30e7\u30f324H2\u304a\u3088\u307325H2\u3068\u306f\u5225\u306b\u72ec\u81ea\u306eKB\u8b58\u5225\u5b50\u3068\u30d3\u30eb\u30c9\u756a\u53f7\u3092\u6301\u3064\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u5909\u66f4\u306b\u3088\u308a\u7ba1\u7406\u8005\u306e\u5206\u304b\u308a\u3084\u3059\u3055\u304c\u5411\u4e0a\u3057\u307e\u3057\u305f\u3002\u8a2d\u7f6e\u304a\u3088\u3073\u7ba1\u7406\u30d7\u30ed\u30bb\u30b9\u306f\u5909\u308f\u3063\u3066\u3044\u307e\u305b\u3093\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\u30f325H2\u304a\u3088\u307324H2: <a href=\"https:\/\/support.microsoft.com\/help\/5074109\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5074109<\/a><\/li>\n<li>Windows 11\u3001\u30d0\u30fc\u30b8\u30e7\u30f323H2: <a href=\"https:\/\/support.microsoft.com\/help\/5073455\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073455<\/a><\/li>\n<li>Windows 11 Enterprise LTSC 2024:\u30db\u30c3\u30c8\u30d1\u30c3\u30c1 <a href=\"https:\/\/support.microsoft.com\/topic\/237710ab-0834-4fdc-a253-9f67c1f069a7\" rel=\"noopener noreferrer\" target=\"_blank\">  \u30d9\u30fc\u30b9\u30e9\u30a4\u30f3<\/a><\/li>\n<li>Windows 10\u3001\u30d0\u30fc\u30b8\u30e7\u30f322H2\u304a\u3088\u307321H2: <a href=\"https:\/\/support.microsoft.com\/help\/5073724\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073724<\/a><\/li>\n<li>Windows 10 Enterprise LTSC 2019\u304a\u3088\u3073Windows Server 2019: <a href=\"https:\/\/support.microsoft.com\/help\/5073723\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073723<\/a><\/li>\n<li>Windows 10 LTSB 2016\u304a\u3088\u3073Windows Server 2016: <a href=\"https:\/\/support.microsoft.com\/help\/5073722\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073722<\/a><\/li>\n<li>Windows Server 2025: <a href=\"https:\/\/support.microsoft.com\/help\/5073379\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073379<\/a><\/li>\n<li>Windows Server 2025 Datacenter: Azure Edition: Hotpatch <a href=\"https:\/\/support.microsoft.com\/topic\/07d1ed4c-f570-492e-a8e0-ab807a5bc296\" rel=\"noopener noreferrer\" target=\"_blank\">  Baseline<\/a><\/li>\n<li>Windows Server 2022: <a href=\"https:\/\/support.microsoft.com\/help\/5073457\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073457<\/a><\/li>\n<li>Windows Server 2022 Datacenter: Azure Edition: Hotpatch <a href=\"https:\/\/support.microsoft.com\/topic\/1be577b2-9a83-4eb7-9840-289ce599f40e\" rel=\"noopener noreferrer\" target=\"_blank\">  Baseline<\/a><\/li>\n<li>Windows Server 2012 R2:\u6708\u6b21\u30ed\u30fc\u30eb\u30a2\u30c3\u30d7: <a href=\"https:\/\/support.microsoft.com\/help\/5073696\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073696<\/a><\/li>\n<li>Windows Server 2012:\u6708\u6b21\u30ed\u30fc\u30eb\u30a2\u30c3\u30d7: <a href=\"https:\/\/support.microsoft.com\/help\/5073698\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073698<\/a><\/li>\n<li>Windows Server 2008 R2 \u30b5\u30fc\u30d3\u30b9\u30d1\u30c3\u30af1:\u6708\u6b21\u30ed\u30fc\u30eb\u30a2\u30c3\u30d7: <a href=\"https:\/\/support.microsoft.com\/help\/5073695\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073695<\/a>&nbsp;\/ \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u307f: <a href=\"https:\/\/support.microsoft.com\/help\/5073699\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073699<\/a><\/li>\n<li>Windows Server 2008 SP2:\u6708\u6b21\u30ed\u30fc\u30eb\u30a2\u30c3\u30d7: <a href=\"https:\/\/support.microsoft.com\/help\/5073697\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073697<\/a> \/ \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u307f: <a href=\"https:\/\/support.microsoft.com\/help\/5073700\" rel=\"noopener noreferrer\" target=\"_blank\">  KB5073700<\/a><\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>MC1217507 | The January 2026 Windows security update is now available Classification stayInformed Last Updated [&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-14498","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14498","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=14498"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14498\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=14498"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=14498"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=14498"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}