---
id: CVE-2026-56157
title: Microsoft SharePoint Server Spoofing Vulnerability
summary: >-
  Improper access control in Microsoft Office SharePoint allows an authorized
  attacker to perform spoofing over a network.
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-284
vendor: Microsoft
product: Microsoft SharePoint Enterprise Server 2016
affected:
  - sharepoint_enterprise_server_2016 >= 16.0.0 < 16.0.5561.1001
  - sharepoint_server_2019 >= 16.0.0 < 16.0.10417.20175
  - sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20434
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-14T18:50:12.077838Z'
published: '2026-07-14'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T18:24:26.332Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-56157'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56157'
    label: Microsoft SharePoint Server Spoofing Vulnerability
tags:
  - cve.org
epss: 0.00496
epssPercentile: 0.39877
ingestedAt: '2026-09-08T17:06:31.907Z'
---

## Overview

Improper access control in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

## Affected

- `sharepoint_enterprise_server_2016 >= 16.0.0 < 16.0.5561.1001`
- `sharepoint_server_2019 >= 16.0.0 < 16.0.10417.20175`
- `sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20434`

## Remediation

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