CVE-2026-70279
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Stored XSS in Microsoft Exchange Server

Publication date: 2026-10-13

Last updated on: 2026-10-13

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.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-19
AI Q&A
2026-10-14
EPSS Evaluated
2026-10-18
NVD
CVE-2026-70279
EUVD
EUVD-2026-100137

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 15.01.0.0
Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 15.02.0.0
Microsoft Microsoft Exchange Server 2019 Cumulative Update 15 15.02.0.0
Microsoft Microsoft Exchange Server Subscription Edition RTM 15.02.0.0

Helpful Resources

Exploitability

CWE
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KEV
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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.

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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. Users might see fake login prompts or have their actions on the site manipulated without their knowledge.

Compliance Impact

This vulnerability, a cross-site scripting flaw in Microsoft Exchange Server, could allow attackers to spoof user interactions or steal sensitive data. Such attacks may lead to unauthorized access to personal or health information, potentially violating GDPR or HIPAA compliance by exposing protected data.

Mitigation Strategies

Apply the latest security updates from Microsoft for Exchange Server as soon as possible to patch the cross-site scripting vulnerability.

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