---
id: CVE-2026-69375
title: >-
  Authorization bypass through user-controlled key in Microsoft Exchange Server
  allows an authorized attacker to perform tampering over a network.
summary: >-
  Authorization bypass through user-controlled key in Microsoft Exchange Server
  allows an authorized attacker to perform tampering over a network.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-639
vendor: microsoft
product: exchange_server
affected:
  - exchange_server = 2016
  - exchange_server = 2019
  - exchange_server_subscription_edition < 15.02.2562.049
patched:
  - exchange_server_subscription_edition 15.02.2562.049
published: '2026-09-08'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T15:55:25.487'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-69375'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69375'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
epss: 0.00644
epssPercentile: 0.50678
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-11T14:51:05.458653Z'
ingestedAt: '2026-09-08T19:08:49.610Z'
---

## Overview

Authorization bypass through user-controlled key in Microsoft Exchange Server allows an authorized attacker to perform tampering over a network.

## Affected

- `exchange_server = 2016`
- `exchange_server = 2019`
- `exchange_server_subscription_edition < 15.02.2562.049`

## Remediation

Upgrade past the affected range:

- `exchange_server_subscription_edition 15.02.2562.049`