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VULNERABILITIES

CVE-2026-55009 Details

Description

Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55009 [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-502Deserialization of Untrusted Data[email protected]

Affected Products

ProductVersions
microsoft exchange server
2016 cumulative_update_23
2019 cumulative_update_14
2019 cumulative_update_15

CPE

  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_23:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_14:*:*:*:*:*:*
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_15:*:*:*:*:*:*

Remediation

  • No remediation found in references.
microsoft exchange server subscription edition
< 15.02.2562.045

CPE

  • cpe:2.3:a:microsoft:exchange_server_subscription_edition:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-55009
NVD Published Date:
Jul 14, 2026
NVD Last Modified:
Jul 24, 2026
Source:
[email protected]
CVE-2026-55009 Details - Not Deferred