---
id: CVE-2026-70355
title: Microsoft SharePoint Server Elevation of Privilege Vulnerability
summary: >-
  Improper neutralization of input during web page generation ('cross-site
  scripting') in Microsoft Office SharePoint allows an authorized attacker to
  elevate privileges over a network.
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N'
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: '2026-08-12T03:59:50.029297Z'
published: '2026-08-11'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T13:45:51.845Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-70355'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70355'
    label: Microsoft SharePoint Server Elevation of Privilege Vulnerability
tags:
  - cve.org
epss: 0.00462
epssPercentile: 0.3934
ingestedAt: '2026-09-08T19:08:49.657Z'
---

## Overview

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to elevate privileges 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.