CVE-2026-45456

Analyzed Analyzed - Analysis Complete

Type Confusion in Microsoft Office

Publication date: 2026-06-09

Last updated on: 2026-06-19

Assigner: Microsoft Corporation

Description

Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized attacker to execute code locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-06-09

Last Modified

2026-06-19

Generated

2026-06-30

AI Q&A

2026-06-09

EPSS Evaluated

2026-06-28

NVD

CVE-2026-45456

EUVD

EUVD-2026-35668

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	sharepoint_server	to 16.0.19725.20384 (exc)
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-843	The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

Attack-Flow Graph

Executive Summary

This vulnerability is a type confusion issue in Microsoft Office where an attacker can access a resource using an incompatible type. This flaw allows an unauthorized attacker to execute code locally on the affected system.

Impact Analysis

The vulnerability can lead to remote code execution, enabling an attacker to run arbitrary code on your system without authorization. This can result in full compromise of confidentiality, integrity, and availability of your data and system.

Compliance Impact

The vulnerability allows unauthorized local code execution in Microsoft Office due to type confusion.

Such unauthorized code execution can lead to compromise of sensitive data, which may impact compliance with standards like GDPR and HIPAA that require protection of personal and health information.

However, the provided information does not explicitly describe the direct effects on compliance with these regulations.

Mitigation Strategies

To mitigate this vulnerability, it is recommended to apply the security updates provided by Microsoft for Microsoft Office as soon as they become available.

Since the vulnerability allows local code execution via type confusion, limiting user privileges and avoiding opening untrusted Office documents can reduce risk until patches are applied.

Hi! I’m here to help you understand CVE-2026-45456. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70