Microsoft Exchange Flaw Lets Authenticated Attackers Read Other Users' Mailboxes
Microsoft issued an out-of-band patch for CVE-2026-96940 (CVSS 8.8), a privilege-escalation weakness in Exchange Server that lets any authenticated user read other mailboxes — a potent espionage vector for on-prem environments.
Summary written by editorial AI · Source link below
Microsoft has released out-of-band security updates to address a high-severity flaw in Microsoft Exchange Server that could allow an attacker to escalate privileges under certain conditions.
The vulnerability, tracked as CVE-2026-96940, is rated 8.8 on the CVSS scoring system.
"Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a
Editorial Analysis
On-premises Exchange remains widespread in European mid-market firms; a flaw enabling silent mailbox access creates immediate data-breach and industrial-espionage exposure.
Apply the out-of-band Exchange patch immediately and audit mailbox access logs for anomalous cross-account reads since the vulnerability window opened.
A high-severity Exchange Server flaw lets authenticated users silently read any mailbox — immediate patching is required to prevent data breach.
Forward-looking interpretation drafted by editorial AI under human review — not a reproduction of the source. See methodology.
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