CVE-2026-55023

Analyzed Analyzed - Analysis Complete

Out-of-bounds Read in Microsoft Office

Publication date: 2026-07-14

Last updated on: 2026-07-16

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-14

Last Modified

2026-07-16

Generated

2026-08-04

AI Q&A

2026-07-15

EPSS Evaluated

2026-08-02

NVD

CVE-2026-55023

EUVD

EUVD-2026-44168

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	sharepoint_server	2019
microsoft	sharepoint_server	2016
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	office_2019	*
microsoft	office_2019	*
microsoft	office_2016	*
microsoft	office_2016	*
microsoft	microsoft_365	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2024	*
microsoft	office_2024	*
microsoft	office_2024	*
microsoft	sharepoint_server	to 16.0.19725.20434 (exc)

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. It allows an unauthorized attacker to access and disclose information stored locally on a system by reading memory outside the intended boundaries.

Detection Guidance

Detection of this vulnerability requires monitoring for out-of-bounds read conditions in Microsoft Office applications. Check for unusual memory access patterns or crashes in Office processes like WINWORD.EXE or EXCEL.EXE. Use system logs to identify suspicious activity related to Office applications.

Impact Analysis

An attacker could exploit this to access sensitive data stored on your device, such as documents or files, potentially leading to unauthorized information disclosure. The impact is local, meaning the attacker must already have some access to the system.

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. Organizations must address it to maintain regulatory compliance.

Mitigation Strategies

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

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