Microsoft Exchange Flaw Lets Authenticated Attackers Read Other Users' Mailboxes
Summary
Microsoft has released out-of-band security updates to fix a high-severity vulnerability in Microsoft Exchange Server. This flaw, tracked as CVE-2026-96940, could enable an authenticated attacker to escalate privileges and potentially read other users' mailboxes.
IFF Assessment
FOE
This vulnerability allows authenticated attackers to escalate privileges and access other users' mailboxes, posing a significant threat to data confidentiality and system integrity.
Severity
8.8
High
Defender Context
This vulnerability in Microsoft Exchange Server requires immediate attention for organizations using the affected versions. Defenders should prioritize applying the out-of-band security updates to mitigate the risk of unauthorized access to user mailboxes and privilege escalation.