CVE-2026-55030

Analyzed Analyzed - Analysis Complete

Cross-Site Scripting in Microsoft Office SharePoint

Publication date: 2026-07-14

Last updated on: 2026-07-15

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

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Meta Information

Published

2026-07-14

Last Modified

2026-07-15

Generated

2026-08-04

AI Q&A

2026-07-15

EPSS Evaluated

2026-08-02

NVD

CVE-2026-55030

EUVD

EUVD-2026-44170

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 into web pages viewed by others.

Impact Analysis

An attacker could exploit this to perform spoofing attacks, tricking users into revealing sensitive information or performing unintended actions. Users might see fake login prompts or malicious content disguised as legitimate SharePoint pages.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection. Organizations may face compliance penalties if exploited.

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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