CVE-2026-69356

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Cross-Site Scripting in Microsoft Exchange Server

Publication date: 2026-09-08

Last updated on: 2026-09-08

Assigner: Microsoft Corporation

Description

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-09-08

Last Modified

2026-09-08

Generated

2026-09-09

AI Q&A

2026-09-09

EPSS Evaluated

N/A

NVD

CVE-2026-69356

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	exchange_server	*

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 is a cross-site scripting (XSS) vulnerability in Microsoft Exchange Server. It occurs when user input is not properly neutralized during web page generation, allowing an attacker to inject malicious scripts. These scripts can then be executed in the context of a user's browser session.

Impact Analysis

An attacker could exploit this to perform spoofing attacks, steal session cookies, or deliver malware. This may lead to unauthorized access to sensitive data, account takeovers, or defacement of web pages. The high CVSS score indicates significant risk.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR's integrity and confidentiality requirements or HIPAA's safeguards for protected health information. Organizations may face fines, legal action, or reputational damage if exploited.

Mitigation Strategies

Apply the latest security updates from Microsoft for Exchange Server immediately. Disable unnecessary user input features in Exchange web interfaces. Monitor network traffic for suspicious activity related to cross-site scripting attempts.

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