CVE-2026-55042

Analyzed Analyzed - Analysis Complete

Use of Uninitialized Resource in Microsoft Office Allows Local Information Disclosure

Publication date: 2026-07-14

Last updated on: 2026-07-16

Assigner: Microsoft Corporation

Description

Use of uninitialized resource in Microsoft Office allows an unauthorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

Probability:
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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-2026-55042

EUVD

EUVD-2026-44216

Affected Vendors & Products

Vendor	Product	Version / Range
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	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-908	The product uses or accesses a resource that has not been initialized.

Attack-Flow Graph

Executive Summary

This vulnerability involves the use of an uninitialized resource in Microsoft Office. An attacker could exploit this to access and disclose information stored locally on a system.

Impact Analysis

An attacker could exploit this to read sensitive data stored on your device, such as documents or personal files, without needing special access privileges.

Compliance Impact

This vulnerability could lead to unauthorized data exposure, potentially violating GDPR or HIPAA if personal or health information is disclosed. Organizations may face compliance penalties if affected systems are not patched.

Mitigation Strategies

Apply the latest security updates from Microsoft Office as soon as they become available to address the uninitialized resource issue.

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