CVE-2026-55022

Analyzed Analyzed - Analysis Complete

Type Confusion in Microsoft Office

Publication date: 2026-07-14

Last updated on: 2026-07-16

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

2026-07-14

Last Modified

2026-07-16

Generated

2026-08-04

AI Q&A

2026-07-15

EPSS Evaluated

2026-08-02

NVD

CVE-2026-55022

EUVD

EUVD-2026-44167

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-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 is a type confusion vulnerability in Microsoft Office. It occurs when the software incorrectly handles data types, allowing an attacker to execute arbitrary code on a victim's system.

Detection Guidance

Detection typically involves checking for unusual behavior in Microsoft Office applications or scanning for known indicators of compromise. Use Microsoft Defender for Office 365 to scan files and emails for malicious content. Check for recent updates from Microsoft to ensure systems are patched.

Impact Analysis

An attacker could trick you into opening a malicious Office file, leading to arbitrary code execution on your device. This could allow them to install malware, steal data, or take control of your system without needing special privileges.

Mitigation Strategies

Apply the latest security updates from Microsoft Office as soon as possible to patch the type confusion vulnerability. Monitor Microsoft's official security advisories for patches and follow their recommended mitigation steps.

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