CVE-2026-45458

8.4

HIGH CVSS 3.1

Microsoft Outlook and Word Remote Code Execution Vulnerability

Overview

Description

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

Details

INFO

Published Date :

June 9, 2026, 5:17 p.m.

Last Modified :

June 11, 2026, 3:37 p.m.

Remotely Exploit :

No

Source :

[email protected]

Impact

Affected Products

The following products are affected by CVE-2026-45458 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product
1	Microsoft	word
2	Microsoft	sharepoint_server
3	Microsoft	365_apps
4	Microsoft	sharepoint_enterprise_server_2016
5	Microsoft	office_365
6	Microsoft	office_macos_2024
7	Microsoft	office_macos_2021
8	Microsoft	sharepoint_server_2016
9	Microsoft	word_2016
10	Microsoft	sharepoint_server_2019
11	Microsoft	office_2024
12	Microsoft	office_2021
13	Microsoft	office_2019
14	Microsoft	microsoft_365

: Total Affected Vendor : 1 | Products : 14

Scoring

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Score	Version	Severity	Vector	Exploitability Score	Impact Score	Source
	CVSS 3.1	HIGH				f38d906d-7342-40ea-92c1-6c4a2c6478c8
	CVSS 3.1	HIGH				[email protected]

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-45458.

URL	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45458	Vendor Advisory

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-45458 is associated with the following CWEs:

CWE-416: Use After Free

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-45458 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-45458 vulnerability anywhere in the article.

CrowdStrike.com

June 2026 Patch Tuesday: Microsoft Patches 206 Vulnerabilities Including Three Publicly Disclosed Zero-Days

Microsoft has addressed 206 vulnerabilities in its June 2026 security update release. This month's patches include fixes for three publicly disclosed zero-day vulnerabilities and 37 Critical vulnerabi ...

Published Date: Jun 10, 2026 (2 weeks, 5 days ago)

TheCyberThrone

Microsoft Patch Tuesday — June 2026

Microsoft’s June 2026 Patch Tuesday is the largest release since the Patch Tuesday program began, surpassing the previous record of 167 CVEs set in October 2025. This month’s release addresses 206 vul ...

Published Date: Jun 10, 2026 (2 weeks, 5 days ago)

Zero Day Initiative

The June 2026 Security Update Review

CVE Title Severity CVSS Public Exploited XI Type CVE-2026-41091 Microsoft Defender Elevation of Privilege Vulnerability Important 7.8 Yes Yes 0 EoP CVE-2026-49160 HTTP.sys Denial of Service Vulnerabil ...

Published Date: Jun 09, 2026 (2 weeks, 6 days ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-45458 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

Initial Analysis by [email protected]

Jun. 11, 2026

Action	Type	Old Value	New Value
Added	CPE Configuration		OR cpe:2.3:a:microsoft:sharepoint_server:2019::::::: cpe:2.3:a:microsoft:sharepoint_server:2016::::enterprise:::* cpe:2.3:a:microsoft:365_apps:-::::enterprise::x64: cpe:2.3:a:microsoft:365_apps:-::::enterprise::x86: cpe:2.3:a:microsoft:word:2016::::::x64:* cpe:2.3:a:microsoft:word:2016::::::x86:* cpe:2.3:a:microsoft:office_2019:-::::::x86:* cpe:2.3:a:microsoft:office_2019:-::::::x64:* cpe:2.3:a:microsoft:sharepoint_server:::::subscription::: versions up to (excluding) 16.0.19725.20384 cpe:2.3:a:microsoft:microsoft_365:-:::::macos::* cpe:2.3:a:microsoft:office_2021:-::::ltsc:-:x64:* cpe:2.3:a:microsoft:office_2021:-::::ltsc:-:x86:* cpe:2.3:a:microsoft:office_2021:-::::ltsc:macos:-:* cpe:2.3:a:microsoft:office_2024:-::::ltsc:-:x64:* cpe:2.3:a:microsoft:office_2024:-::::ltsc:-:x86:* cpe:2.3:a:microsoft:office_2024:-::::ltsc:macos:-:*
Added	Reference Type		Microsoft Corporation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45458 Types: Vendor Advisory

New CVE Received by [email protected]

Jun. 09, 2026

Action	Type	New Value
Added	Description	Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized attacker to execute code locally.
Added	CVSS V3.1	AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Added	CWE	CWE-416
Added	Reference	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45458

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.