Nearly 22,000 Microsoft Exchange servers vulnerable to hijack attacks

Nearly 22,000 Microsoft Exchange servers exposed online remain unpatched against a high-severity authentication bypass vulnerability that allows attackers to hijack all user mailboxes. [...]

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https://www.bleepingcomputer.com/news/security/nearly-22-000-microsoft-exchange-servers-vulnerable-to-hijack-attacks/

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https://www.bleepingcomputer.com/news/security/nearly-22-000-microsoft-exchange-servers-vulnerable-to-hijack-attacks/

author_name

Sergiu Gatlan

id: 2830
uid: OQESF
insdate: 2026-09-01 13:10:06
title: Nearly 22,000 Microsoft Exchange servers vulnerable to hijack attacks
additional: Nearly 22,000 Microsoft Exchange servers exposed online remain unpatched against a high-severity authentication bypass vulnerability that allows attackers to hijack all user mailboxes. [...]
category: Cybersecurity
md5:
guid: https://www.bleepingcomputer.com/news/security/nearly-22-000-microsoft-exchange-servers-vulnerable-to-hijack-attacks/
source_url: https://www.bleepingcomputer.com/news/security/nearly-22-000-microsoft-exchange-servers-vulnerable-to-hijack-attacks/
updated:
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author_name: Sergiu Gatlan
author_link:
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