---
id: CVE-2026-57105
title: Microsoft Office SharePoint 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: high
cvss: 8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-79
vendor: Microsoft
product: Microsoft SharePoint Server 2019
affected:
  - sharepoint_server_2019 >= 16.0.0 < 16.0.10417.20198
  - sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20522
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-07T00:00:00+00:00'
published: '2026-08-11'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T19:35:17.087Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-57105'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57105'
    label: Microsoft Office SharePoint Spoofing Vulnerability
tags:
  - cve.org
epss: 0.0062
epssPercentile: 0.47467
ingestedAt: '2026-09-08T18:07:34.903Z'
---

## 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_2019 >= 16.0.0 < 16.0.10417.20198`
- `sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20522`

## Remediation

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