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CVE record · CVE-2026-70279

Microsoft Exchange Server Spoofing Vulnerability

CVSS 9.3 CriticalCriticalEPSS 0.013 · 70th percentile

Critical, because:

  • CVSS score 9.3: 9.0 or more.

How we decide what’s critical

Published by the CVE Program (CNA: microsoft) at 13 Oct 2026, 19:01 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23
  • affected 15.01.0.0 to before 15.01.2507.077 custom
Microsoft Microsoft Exchange Server 2019 Cumulative Update 14
  • affected 15.02.0.0 to before 15.02.1544.050 custom
Microsoft Microsoft Exchange Server 2019 Cumulative Update 15
  • affected 15.02.0.0 to before 15.02.1748.055 custom
Microsoft Microsoft Exchange Server Subscription Edition RTM
  • affected 15.02.0.0 to before 15.02.2562.056 custom
Identifiers
CVE-2026-70279
CNA
microsoft
Weakness (CWE)
CWE-79
Tags
Published
13 Oct 2026
Updated
31 Oct 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.3 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.013, the 70th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 13 Oct 2026, 19:01 UTC Confirmed by the CVE List
  2. 31 Oct 2026, 16:26 UTC First seen by agentprime

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.