CVE-2026-55126

Analyzed Analyzed - Analysis Complete

Cross-Site Scripting in Microsoft Office SharePoint

Publication date: 2026-07-14

Last updated on: 2026-07-16

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

EPSS Scores

Probability:
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Meta Information

Published

2026-07-14

Last Modified

2026-07-16

Generated

2026-08-04

AI Q&A

2026-07-15

EPSS Evaluated

2026-08-02

NVD

CVE-2026-55126

EUVD

EUVD-2026-44207

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	sharepoint_server	2019
microsoft	sharepoint_server	2016
microsoft	sharepoint_server	to 16.0.19725.20434 (exc)

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) flaw in Microsoft Office SharePoint. It occurs when user input is not properly neutralized during web page generation, allowing an attacker to inject malicious scripts.

Impact Analysis

An authorized attacker could exploit this to perform spoofing attacks over a network. This may lead to unauthorized actions, data theft, or misleading users by impersonating legitimate content.

Compliance Impact

This vulnerability could compromise data integrity and confidentiality, potentially violating GDPR (data protection) and HIPAA (health information privacy) by enabling unauthorized access or data exposure.

Mitigation Strategies

Apply the latest security updates from Microsoft for Office SharePoint as soon as possible to address the cross-site scripting vulnerability.

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