{"id":219720,"date":"2025-08-09T05:25:16","date_gmt":"2025-08-09T10:25:16","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2025\/08\/microsoft-warns-of-high-severity-flaw-in-hybrid-exchange-deployments"},"modified":"2025-08-09T05:25:16","modified_gmt":"2025-08-09T10:25:16","slug":"microsoft-warns-of-high-severity-flaw-in-hybrid-exchange-deployments","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2025\/08\/microsoft-warns-of-high-severity-flaw-in-hybrid-exchange-deployments","title":{"rendered":"Microsoft warns of high-severity flaw in hybrid Exchange deployments"},"content":{"rendered":"<p><a class=\"aligncenter blog-photo\" href=\"https:\/\/lifeboat.com\/blog.images\/microsoft-warns-of-high-severity-flaw-in-hybrid-exchange-deployments.jpg\"><\/a><\/p>\n<p>Microsoft has warned customers to mitigate a high-severity vulnerability in Exchange Server hybrid deployments that could allow attackers to escalate privileges in Exchange Online cloud environments undetected.<\/p>\n<p>Exchange hybrid configurations connect on-premises Exchange servers to Exchange Online (part of Microsoft 365), allowing for seamless integration of email and calendar features between on-premises and cloud mailboxes, including shared calendars, global address lists, and mail flow.<\/p>\n<p>However, in hybrid Exchange deployments, on-prem Exchange Server and Exchange Online also share the same service principal, which is a shared identity used for authentication between the two environments.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Microsoft has warned customers to mitigate a high-severity vulnerability in Exchange Server hybrid deployments that could allow attackers to escalate privileges in Exchange Online cloud environments undetected. Exchange hybrid configurations connect on-premises Exchange servers to Exchange Online (part of Microsoft 365), allowing for seamless integration of email and calendar features between on-premises and cloud mailboxes, [\u2026]<\/p>\n","protected":false},"author":427,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1492],"tags":[],"class_list":["post-219720","post","type-post","status-publish","format-standard","hentry","category-security"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/219720","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/427"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=219720"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/219720\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=219720"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=219720"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=219720"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}