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#9 BleepingComputer general September 01, 2026 at 12:38 UTC

Nearly 22,000 Microsoft Exchange servers vulnerable to hijack attacks

By Sergiu Gatlan

AI Summary

Nearly 22,000 Microsoft Exchange servers exposed to the internet remain unpatched against a high-severity authentication bypass vulnerability that allows attackers to hijack all user mailboxes on affected instances. The scale of exposure is particularly significant given Exchange's role as a primary email and calendar infrastructure component in enterprise environments. Administrators should cross-reference their Exchange deployments against Microsoft's patching guidance and prioritize internet-facing instances.

Read full article → https://www.bleepingcomputer.com/news/security/nea…

Relevance score: 80.0/100

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