CVE-2026-69375

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Authorization Bypass in Microsoft Exchange Server

Publication date: 2026-09-08

Last updated on: 2026-09-08

Assigner: Microsoft Corporation

Description

Authorization bypass through user-controlled key in Microsoft Exchange Server allows an authorized attacker to perform tampering over a network.

CVSS Scores

EPSS Scores

Probability:
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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-2026-69375

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	exchange_server	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-639	The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

Attack-Flow Graph

Executive Summary

This vulnerability is an authorization bypass in Microsoft Exchange Server. It allows an authorized attacker to manipulate data over a network by exploiting a user-controlled key. This could lead to unauthorized modifications without proper authentication.

Impact Analysis

An attacker could tamper with sensitive data, alter configurations, or perform unauthorized actions within the Exchange Server environment. This may result in data integrity issues, unauthorized access to emails or files, and potential disruption of services.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR or HIPAA by allowing unauthorized data tampering or access. GDPR requires data integrity and confidentiality, while HIPAA mandates protection of health information. Exploitation may result in regulatory penalties or legal consequences.

Mitigation Strategies

Apply the latest security updates from Microsoft for Exchange Server to address the authorization bypass issue. Review and restrict user permissions to prevent unauthorized modifications.

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