CVE-2026-70310

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

2026-08-11

EPSS Evaluated

2026-08-30

NVD

CVE-2026-70310

EUVD

EUVD-2026-56570

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 flaw in Microsoft Office Word. It allows an unauthorized attacker to access and disclose information stored locally on a system by reading beyond the intended memory boundaries.

Detection Guidance

This vulnerability involves an out-of-bounds read in Microsoft Office Word, which may allow local information disclosure. Detection typically requires monitoring for unusual behavior in Microsoft Office applications or scanning for known indicators of compromise. Check for updates from Microsoft to patch this issue. Use system logs to identify suspicious Word document processing activities.

Impact Analysis

An attacker could exploit this to access sensitive data stored on your device, such as documents or files opened in Word. This could lead to unauthorized information disclosure if the attacker gains local access to your system.

Compliance Impact

This vulnerability allows unauthorized local disclosure of information, which could lead to unauthorized access to sensitive data. This may impact compliance with GDPR (potential data breach) and HIPAA (unauthorized disclosure of protected health information).

Mitigation Strategies

Apply the latest security updates from Microsoft for Office Word to patch the out-of-bounds read vulnerability. Monitor Microsoft's official security advisories for updates and ensure all systems are updated promptly.

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