CVE-2026-45458

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:
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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-2026-45458

EUVD

EUVD-2026-35669

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	sharepoint_server	2019
microsoft	sharepoint_server	2016
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	word	2016
microsoft	word	2016
microsoft	office_2019	*
microsoft	office_2019	*
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-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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 local code execution by an unauthorized attacker, which means the attacker could run malicious code on your system without permission. This can compromise the confidentiality, integrity, and availability of your data and system.

Compliance Impact

The vulnerability allows an unauthorized attacker to execute code locally through type confusion in Microsoft Office, which could lead to unauthorized access or manipulation of sensitive data.

Such unauthorized access and potential data compromise may impact compliance with standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive information.

However, specific effects on compliance are not detailed in the provided information.

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