---
id: CVE-2026-69356
title: >-
  Improper neutralization of input during web page generation ('cross-site
  scripting') in Microsoft Exchange Server allows an unauthorized attacker to
  perform spoofing over a network.
summary: >-
  Improper neutralization of input during web page generation ('cross-site
  scripting') in Microsoft Exchange Server allows an unauthorized attacker to
  perform spoofing over a network.
severity: critical
cvss: 9.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N'
cwe:
  - CWE-79
vendor: Microsoft
product: Microsoft Exchange Server 2016 Cumulative Update 23
affected:
  - exchange_server_2016_cumulative_update_23 >= 15.01.0.0 < 15.01.2507.073
  - exchange_server_2019_cumulative_update_14 >= 15.02.0.0 < 15.02.1544.046
  - exchange_server_2019_cumulative_update_15 >= 15.02.0.0 < 15.02.1748.051
  - exchange_server_subscription_edition_rtm >= 15.02.0.0 < 15.02.2562.049
published: '2026-09-08'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T15:17:37.440'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-69356'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69356'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-10T14:18:13.298871Z'
epss: 0.007
epssPercentile: 0.5179
ingestedAt: '2026-09-08T19:08:49.610Z'
---

## Overview

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

## Remediation

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