---
id: CVE-2026-88209
title: >-
  Improper neutralization of input during web page generation ('cross-site
  scripting') in Microsoft Office SharePoint allows an authorized attacker to
  perform spoofing over a network.
summary: >-
  Improper neutralization of input during web page generation ('cross-site
  scripting') in Microsoft Office SharePoint allows an authorized attacker to
  perform spoofing over a network.
severity: medium
cvss: 4.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: microsoft
product: sharepoint_server
affected:
  - sharepoint_server < 16.0.20326.20190
patched:
  - sharepoint_server 16.0.20326.20190
published: '2026-10-13'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T19:43:39.380'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88209'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88209'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
epss: 0.00362
epssPercentile: 0.28412
ingestedAt: '2026-10-13T19:43:29.241Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-13T19:49:34.618404Z'
---

## Overview

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

## Affected

- `sharepoint_server < 16.0.20326.20190`

## Remediation

Upgrade past the affected range:

- `sharepoint_server 16.0.20326.20190`