---
id: CVE-2026-20945
title: Microsoft SharePoint Server Spoofing Vulnerability
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/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-79
vendor: Microsoft
product: Microsoft SharePoint Enterprise Server 2016
affected:
  - sharepoint_enterprise_server_2016 >= 16.0.0 < 16.0.5548.1003
  - sharepoint_server_2019 >= 16.0.0 < 16.0.10417.20114
  - sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20210
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-04-14T19:03:46.928499Z'
published: '2026-04-14'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T17:24:52.543Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-20945'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20945'
    label: Microsoft SharePoint Server Spoofing Vulnerability
tags:
  - cve.org
epss: 0.19075
epssPercentile: 0.97222
ingestedAt: '2026-09-25T18:14:20.461Z'
---

## 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_enterprise_server_2016 >= 16.0.0 < 16.0.5548.1003`
- `sharepoint_server_2019 >= 16.0.0 < 16.0.10417.20114`
- `sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20210`

## Remediation

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