Out-of-band Exchange Server update fixes high-severity mailbox access bug (CVE-2026-96940)

Microsoft has pushed out an out-of-band security update for Exchange Server that fixes a high-severity vulnerability (CVE-2026-96940) that may allow authenticated attackers to read emails and attachments of other users in the same organization, but “does not allow access across tenant boundaries.”…

security

Sources

Vulnerabilities

Why this score
Signals contributing to the severity score
SignalPoints
cvss high — 8.810
widely deployed15