CVE-2026-63531

Analyzed Analyzed - Analysis Complete

Out-of-Bounds Read in Microsoft Office Word

Publication date: 2026-08-11

Last updated on: 2026-08-14

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-11

Last Modified

2026-08-14

Generated

2026-09-01

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-63531

EUVD

EUVD-2026-56697

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	word	2016
microsoft	word	2016
microsoft	office_2019	*
microsoft	office_2019	*
microsoft	microsoft_365	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2024	*
microsoft	office_2024	*
microsoft	office_2024	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is an out-of-bounds read issue in Microsoft Office Word. It allows an unauthorized attacker to access and disclose information stored locally on a system by exploiting this flaw.

Detection Guidance

Detection of this vulnerability requires checking for specific versions of Microsoft Office Word that are vulnerable to the out-of-bounds read issue. Review installed Office versions and compare them against Microsoft's security updates.

Impact Analysis

An attacker could exploit this to read sensitive data from your system, such as documents or files, potentially leading to unauthorized information disclosure. The impact is limited to local access.

Compliance Impact

This vulnerability could lead to unauthorized data exposure, which may violate compliance requirements like GDPR or HIPAA if sensitive personal or health information is disclosed.

Mitigation Strategies

Apply the latest security updates from Microsoft for Office Word as soon as they become available to patch the out-of-bounds read vulnerability.

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