vulnerability · Mon 05 Oct 2026 · 10:38 UTC
Out-of-band Exchange Server update fixes high-severity mailbox access bug (CVE-2026-96940)
Filed UTCSource HNS ↗
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.” CVE-2026-96940 was discovered internally and, according to the Exchange Server Team, they “are not aware of active exploitation. …
Signals
as the pipeline stamped them- Shodan
- Shodan: ~117,000 Exchange exposed worldwide (05 Oct)
- What to do
- ~117,000 Exchange are exposed worldwide — check your own version.
CVE
KEV from CISA · EPSS from FIRST| Id | KEV | EPSS | Reference |
|---|---|---|---|
| CVE-2026-96940 | — | 0.48% | NVD ↗ |
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