---
id: CVE-2026-96940
title: >-
  Weak authorization in Microsoft Exchange Server allows an authenticated
  attacker to elevate privileges over a network.
summary: >-
  Weak authorization in Microsoft Exchange Server allows an authenticated
  attacker to elevate privileges over a network.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-1390
vendor: Microsoft
product: Microsoft Exchange Server 2016 Cumulative Update 23
affected:
  - exchange_server_2016_cumulative_update_23 >= 15.01.0.0 < 15.01.2507.075
  - exchange_server_2019_cumulative_update_14 >= 15.02.0.0 < 15.02.1544.048
  - exchange_server_2019_cumulative_update_15 >= 15.02.0.0 < 15.02.1748.053
  - exchange_server_subscription_edition_rtm >= 15.02.0.0 < 15.02.2562.053
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T21:16:58.060'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-96940'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96940'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-02T20:14:42.856638Z'
ingestedAt: '2026-10-02T22:33:09.842Z'
---

## Overview

Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.