Microsoft Exchange Server Vulnerability CVE-2026-96940 Disclosed
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- •CVE-2026-96940 allows privilege escalation in Microsoft Exchange Server.
- •Authenticated attackers can access other users' mailboxes within the same organization.
- •On-premises administrators must install September V2 patches to mitigate this vulnerability.
On October 2, 2026, Microsoft disclosed CVE-2026-96940, a privilege escalation vulnerability in Microsoft Exchange Server. This flaw allows authenticated attackers to gain unauthorized access to other users' mailboxes within the same organization. The vulnerability has a CVSS score of 8.8, categorizing it as high severity. Microsoft has already deployed a fix for Exchange Online, and on-premises administrators are advised to install the September V2 patches to mitigate the risk. The vulnerability does not allow access across tenant boundaries. The patch is crucial as it builds on previous updates addressing remote code execution and mailbox takeover risks. Administrators should verify the installation of the V2 patches to ensure protection against this flaw.
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