CVE-2026-66806
Received Received - Intake

Microsoft Office Word Off-by-One Information Disclosure

Publication date: 2026-08-11

Last updated on: 2026-08-11

Assigner: Microsoft Corporation

Description
Off-by-one error in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

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Meta Information

Published
2026-08-11
Last Modified
2026-08-11
Generated
2026-08-11
AI Q&A
2026-08-11
EPSS Evaluated
N/A
NVD
CVE-2026-66806
EUVD
EUVD-2026-56748

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft office_word *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-193 A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

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Executive Summary

This is an off-by-one error in Microsoft Office Word that could allow an unauthorized attacker to access and disclose information stored locally on a system.

Impact Analysis

An attacker could exploit this to read sensitive data from your device, such as documents or files, if they have local access. The impact is limited to information disclosure and does not allow code execution or system takeover.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, potentially violating GDPR (data protection) and HIPAA (health information privacy) requirements. Organizations must address it to maintain compliance.

Mitigation Strategies

Apply the latest security updates from Microsoft for Office Word as soon as they become available to patch the off-by-one error.

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