{"id":18183,"date":"2026-08-30T15:01:15","date_gmt":"2026-08-30T06:01:15","guid":{"rendered":"https:\/\/m365jp.net\/?p=18183"},"modified":"2026-08-30T15:12:52","modified_gmt":"2026-08-30T06:12:52","slug":"servicedegradation-dz1463442-microsoft-defender-xdr-users-browsers-hang-in-microsoft-defender-for-office-365-when-editing-attack-simulation-training-end-user-notifications","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-08-30-servicedegradation-dz1463442-microsoft-defender-xdr-users-browsers-hang-in-microsoft-defender-for-office-365-when-editing-attack-simulation-training-end-user-notifications","title":{"rendered":"[serviceDegradation] DZ1463442 | Microsoft Defender XDR | Users’ browsers hang in Microsoft Defender for Office 365 when editing attack simulation training end user notifications"},"content":{"rendered":"
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DZ1463442 | Microsoft Defender XDR | Users’ browsers hang in Microsoft Defender for Office 365 when editing attack simulation training end user notifications<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n\n\n\n\n\n\n\n\n\n
Status<\/th>\nserviceDegradation<\/td>\n<\/tr>\n
Classification<\/th>\nadvisory<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers’ browsers hang when editing Microsoft Defender for Office 365 attack simulation training end user notifications.<\/td>\n<\/tr>\n
Last Updated<\/th>\n08\/30\/2026 05:27:16<\/td>\n<\/tr>\n
Start Time<\/th>\n08\/28\/2026 18:44:23<\/td>\n<\/tr>\n
End Time<\/th>\n<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Users’ browsers hang in Microsoft Defender for Office 365 when editing attack simulation training end user notifications <\/p>\n

User impact: Users’ browsers hang when editing Microsoft Defender for Office 365 attack simulation training end user notifications. <\/p>\n

More info: When the browser hang occurs, the browser hangs indefinitely until the users exits out. This occurs before the user is able to perform the notification edits. <\/p>\n

Current status: Following our review of the internal reproduction of impact and HAR logs provided by a subset of affected users, we\u2019ve determined that there is a latent code regression that is causing users\u2019 browsers to hang in Microsoft Defender for Office 365 when editing attack simulation training end user notifications and resulting in impact. We\u2019ve developed a code fix to address this issue and anticipate that the deployment progress will begin prior to our next scheduled update. At which point, we aim to provide a remediation timeline. <\/p>\n

Scope of impact: Some users who are utilizing Microsoft Defender for Office 365 users editing attack simulation training end user notifications are impacted. This section may be updated as the investigation progresses. <\/p>\n

Start time: Tuesday, August 11, 2026, at 2:30 PM UTC <\/p>\n

Root cause: A latent code regression that is causing users\u2019 browsers to hang in Microsoft Defender for Office 365 when editing attack simulation training end user notifications and resulting in impact. <\/p>\n

Next update by: Tuesday, September 1, 2026, at 7:00 AM UTC<\/td>\n<\/tr>\n

Machine Translation<\/th>\n\u30bf\u30a4\u30c8\u30eb:Microsoft Defender for Office 365\u3067\u3001\u653b\u6483\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u306e\u30a8\u30f3\u30c9\u30e6\u30fc\u30b6\u30fc\u901a\u77e5\u3092\u7de8\u96c6\u3059\u308b\u969b\u306b\u30e6\u30fc\u30b6\u30fc\u306e\u30d6\u30e9\u30a6\u30b6\u304c\u30d5\u30ea\u30fc\u30ba\u3059\u308b <\/p>\n

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\u73fe\u72b6:\u5f71\u97ff\u3092\u53d7\u3051\u305f\u4e00\u90e8\u306e\u30e6\u30fc\u30b6\u30fc\u304b\u3089\u63d0\u4f9b\u3055\u308c\u305f\u5185\u90e8\u306e\u30a4\u30f3\u30d1\u30af\u30c8\u518d\u73fe\u304a\u3088\u3073HAR\u30ed\u30b0\u306e\u30ec\u30d3\u30e5\u30fc\u306e\u7d50\u679c\u3001Microsoft Defender for Office 365\u306e\u653b\u6483\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3001\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u3001\u30a8\u30f3\u30c9\u30e6\u30fc\u30b6\u30fc\u901a\u77e5\u306e\u7de8\u96c6\u6642\u306b\u30e6\u30fc\u30b6\u30fc\u306e\u30d6\u30e9\u30a6\u30b6\u304c\u30d5\u30ea\u30fc\u30ba\u3057\u5f71\u97ff\u304c\u751f\u3058\u3066\u3044\u308b\u6f5c\u5728\u7684\u306a\u30b3\u30fc\u30c9\u56de\u5e30\u304c\u78ba\u8a8d\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u554f\u984c\u306b\u5bfe\u51e6\u3059\u308b\u305f\u3081\u306e\u30b3\u30fc\u30c9\u4fee\u6b63\u3092\u958b\u767a\u3057\u3001\u6b21\u56de\u306e\u4e88\u5b9a\u3055\u308c\u305f\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u524d\u306b\u5c55\u958b\u306e\u9032\u6357\u3092\u958b\u59cb\u3059\u308b\u4e88\u5b9a\u3067\u3059\u3002\u305d\u306e\u6642\u70b9\u3067\u3001\u4fee\u6b63\u306e\u30bf\u30a4\u30e0\u30e9\u30a4\u30f3\u3092\u63d0\u4f9b\u3059\u308b\u3053\u3068\u3092\u76ee\u6307\u3057\u3066\u3044\u307e\u3059\u3002 <\/p>\n

\u5f71\u97ff\u7bc4\u56f2:Microsoft Defender for Office 365\u306e\u30e6\u30fc\u30b6\u30fc\u3067\u653b\u6483\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u306e\u30a8\u30f3\u30c9\u30e6\u30fc\u30b6\u30fc\u901a\u77e5\u3092\u7de8\u96c6\u3057\u3066\u3044\u308b\u4e00\u90e8\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u5f71\u97ff\u3092\u53d7\u3051\u307e\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u306f\u8abf\u67fb\u306e\u9032\u5c55\u306b\u4f34\u3044\u66f4\u65b0\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002 <\/p>\n

\u958b\u59cb\u6642\u9593:2026\u5e748\u670811\u65e5\u706b\u66dc\u65e5 \u5348\u5f8c2\u664230\u5206 UTC <\/p>\n

\u6839\u672c\u539f\u56e0:Microsoft Defender for Office 365\u306e\u653b\u6483\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3001\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u3001\u30a8\u30f3\u30c9\u30e6\u30fc\u30b6\u30fc\u901a\u77e5\u306e\u7de8\u96c6\u6642\u306b\u30e6\u30fc\u30b6\u30fc\u306e\u30d6\u30e9\u30a6\u30b6\u304c\u30d5\u30ea\u30fc\u30ba\u3057\u3001\u5f71\u97ff\u3092\u53ca\u307c\u3057\u3066\u3044\u308b\u6f5c\u5728\u7684\u306a\u30b3\u30fc\u30c9\u56de\u5e30\u3002 <\/p>\n

\u6b21\u56de\u66f4\u65b0:2026\u5e749\u67081\u65e5\u706b\u66dc\u65e5 \u5348\u524d7\u6642 UTC<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

DZ1463442 | Microsoft Defender XDR | Users’ browsers hang in Microsoft Defender for Office 365 when edit […]<\/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-18183","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/18183","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=18183"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/18183\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=18183"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=18183"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=18183"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}