All vulnerabilities
CVE-2026-87695

Microsoft Exchange Server Elevation of Privilege Vulnerability

Microsoft Microsoft Exchange Server 2016 Cumulative Update 23Applications & CMS
Open in ThreatlineRecord JSON
CVSS
7.8High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.24%Chance of exploitation activity in the next 30 days, higher than 13% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in15.01.2507.077Also 15.02.1544.050, 15.02.1748.055 and 1 moreCVE List
Published13 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

  • 15.01.2507.077Microsoft Exchange Server 2016 Cumulative Update 23CVE List
  • 15.02.1544.050Microsoft Exchange Server 2019 Cumulative Update 14CVE List
  • 15.02.1748.055Microsoft Exchange Server 2019 Cumulative Update 15CVE List
  • 15.02.2562.056Microsoft 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.

Vendor and government advisories 1

Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

Description

Inclusion of functionality from untrusted control sphere in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.

Text from CVE List

Affected versions 4

  • Microsoft Exchange Server 2016 Cumulative Update 23affected: 15.01.0.0 before 15.01.2507.077CVE List
  • Microsoft Exchange Server 2019 Cumulative Update 14affected: 15.02.0.0 before 15.02.1544.050CVE List
  • Microsoft Exchange Server 2019 Cumulative Update 15affected: 15.02.0.0 before 15.02.1748.055CVE List
  • Microsoft Exchange Server Subscription Edition RTMaffected: 15.02.0.0 before 15.02.2562.056CVE List

References 1