---
id: CVE-2020-1106
title: >-
  A cross-site-scripting (XSS) vulnerability exists when Microsoft SharePoint
  Server does not properly sanitize a specially crafted web request to an
  affected SharePoint server
summary: >-
  A cross-site-scripting (XSS) vulnerability exists when Microsoft SharePoint
  Server does not properly sanitize a specially crafted web request to an
  affected SharePoint server. An authenticated attacker could exploit the
  vulnerability by …
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
  - CWE-79
vendor: microsoft
product: sharepoint_enterprise_server
affected:
  - sharepoint_enterprise_server = 2016
  - sharepoint_foundation = 2013
  - sharepoint_server = 2019
published: '2020-05-21'
updated: '2026-08-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-1106'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1106'
    label: secure@microsoft.com
  - url: >-
      https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1106
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1106'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1106'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.03984
epssPercentile: 0.90065
ingestedAt: '2026-08-19T17:42:38.174Z'
---

## Overview

A cross-site-scripting (XSS) vulnerability exists when Microsoft SharePoint Server does not properly sanitize a specially crafted web request to an affected SharePoint server. An authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected SharePoint server.
The attacker who successfully exploited the vulnerability could then perform cross-site scripting attacks on affected systems and run script in the security context of the current user. The attacks could allow the attacker to read content that the attacker is not authorized to read, use the victim's identity to take actions on the SharePoint site on behalf of the user, such as change permissions and delete content, and inject malicious content in the browser of the user.
The security update addresses the vulnerability by helping to ensure that SharePoint Server properly sanitizes web requests.

## Affected

- `sharepoint_enterprise_server = 2016`
- `sharepoint_foundation = 2013`
- `sharepoint_server = 2019`

## Remediation

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