All vulnerabilities
CVE-2026-96940

Microsoft Exchange Server Elevation of Privilege Vulnerability

Microsoft Microsoft Exchange Server 2016 Cumulative Update 23Applications & CMS
Open in ThreatlineRecord JSON
CVSS
8.8High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.48%Chance of exploitation activity in the next 30 days, higher than 40% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in15.01.2507.075Also 15.02.1544.048, 15.02.1748.053 and 1 moreCVE List
Published2 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

  • 15.01.2507.075Microsoft Exchange Server 2016 Cumulative Update 23CVE List
  • 15.02.1544.048Microsoft Exchange Server 2019 Cumulative Update 14CVE List
  • 15.02.1748.053Microsoft Exchange Server 2019 Cumulative Update 15CVE List
  • 15.02.2562.053Microsoft Exchange Server Subscription Edition RTMCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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

Text from CVE List

Affected versions 4

  • Microsoft Exchange Server 2016 Cumulative Update 23affected: 15.01.0.0 before 15.01.2507.075CVE List
  • Microsoft Exchange Server 2019 Cumulative Update 14affected: 15.02.0.0 before 15.02.1544.048CVE List
  • Microsoft Exchange Server 2019 Cumulative Update 15affected: 15.02.0.0 before 15.02.1748.053CVE List
  • Microsoft Exchange Server Subscription Edition RTMaffected: 15.02.0.0 before 15.02.2562.053CVE List

References 1