CVE-2026-78519

Analyzed Analyzed - Analysis Complete

Use of Uninitialized Resource in Microsoft Office Outlook Allows Code Execution

Publication date: 2026-09-08

Last updated on: 2026-09-09

Assigner: Microsoft Corporation

Description

Use of uninitialized resource in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-08

Last Modified

2026-09-09

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-78519

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	outlook	2016
microsoft	outlook	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-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 Outlook. An attacker could exploit this to execute arbitrary code remotely over a network without authentication.

Impact Analysis

An attacker could gain control of your system, steal data, install malware, or perform other malicious actions. This could lead to significant security breaches, data loss, or unauthorized access to sensitive information.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations may face legal penalties, fines, or reputational damage.

Mitigation Strategies

Apply the latest security updates from Microsoft for Outlook and Office applications as soon as they become available to patch the uninitialized resource vulnerability.

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