Cross-Site Scripting in Microsoft SharePoint Enables Network Spoofing

Publication date: 2026-01-13

Last updated on: 2026-01-13

Assigner: Microsoft Corporation

Description

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.

CVSS Scores

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Meta Information

Published

2026-01-13

Last Modified

2026-01-13

Generated

2026-07-06

AI Q&A

2026-01-14

EPSS Evaluated

2026-07-05

NVD

CVE-2026-20959

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	office_sharepoint	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This vulnerability is a cross-site scripting (XSS) issue in Microsoft Office SharePoint where improper neutralization of input during web page generation allows an authorized attacker to perform spoofing over a network. [1]

Impact Analysis

An attacker who is authorized can exploit this vulnerability to perform spoofing attacks over a network, potentially misleading users or systems by presenting false information. [1]

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