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Vulnerabilities

Vulnerability · CVE-2026-96940

Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Published Oct 2, 2026 · catalog updated Oct 15, 2026 · exchange server

Check if you run it

No confirmed exploitation is on record for CVE-2026-96940. EPSS is 0.48%. Act only if a listed version of exchange server is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.48%
Remediation
Advisory link
Affected products
cpe microsoft/exchange server · cpe microsoft/exchange server subscription edition

Microsoft heeft kwetsbaarheden verholpen in Exchange. Een kwaadwillende kan de kwetsbaarheden misbruiken om zich voor te doen als andere gebruiker, zich verhoogde rechten toe te kennen en willekeurige code uit te voeren met rechten van het proces. Van de kwetsbaarheid met kenmerk CVE-2026-96940 is eerder al een out-of-band update verschenen, maar is ook opgenomen in deze cumulatieve update.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/exchange server2016
  • cpe microsoft/exchange server2019
  • cpe microsoft/exchange server subscription editionversion unspecified

How to fix CVE-2026-96940

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-96940. EPSS is 0.48%. Act only if a listed version of exchange server is installed.

Which versions are affected?

Compare what you have installed with microsoft/exchange server 2016; microsoft/exchange server 2019. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-1390. EPSS 0.48%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 2, 2026 · NIST NVD

    Detected

    Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

  2. Oct 15, 2026 · NIST NVD

    Updated

    Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Sources

  • CVE.orgVulnerability recordCVE-2026-96940

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-96940

    30-day exploitation probability 0.5%

    first.org
  • NCSC NetherlandsGovernment advisoryCVE-2026-96940

    Microsoft heeft kwetsbaarheden verholpen in Exchange. Een kwaadwillende kan de kwetsbaarheden misbruiken om zich voor te doen als andere gebruiker, zich verhoogde rechten toe te kennen en willekeurige code uit te voeren met rechten van het proces. Van de kwetsbaarheid met kenmerk

    advisories.ncsc.nl
  • NIST NVDVulnerability recordCVE-2026-96940

    Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.