CVE-2026-83949

Analyzed Analyzed - Analysis Complete

Microsoft Office Word Buffer Over-Read Vulnerability

Publication date: 2026-09-08

Last updated on: 2026-09-08

Assigner: Microsoft Corporation

Description

Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-08

Generated

2026-09-30

AI Q&A

2026-09-09

EPSS Evaluated

2026-09-27

NVD

CVE-2026-83949

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	office_2021	*
microsoft	office_2021	*
microsoft	office_2024	*
microsoft	office_2024	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-126	The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.

Attack-Flow Graph

Executive Summary

This is a buffer over-read vulnerability in Microsoft Office Word. It allows an unauthorized attacker to read memory outside the intended buffer, potentially exposing sensitive information stored locally on the affected system.

Impact Analysis

An attacker could exploit this to access confidential data stored on your device, such as documents, credentials, or other sensitive information. The impact is limited to local disclosure and requires some user interaction to trigger.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Organizations must address it to maintain data protection standards.

Mitigation Strategies

Apply the latest security updates from Microsoft for affected Office Word versions. Disable automatic opening of untrusted documents if possible. Monitor Microsoft's security advisories for patches.

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