---
id: CVE-2026-45456
title: Microsoft Outlook and Word Remote Code Execution Vulnerability
summary: >-
  Access of resource using incompatible type ('type confusion') in Microsoft
  Office allows an unauthorized attacker to execute code locally.
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-843
vendor: Microsoft
product: Microsoft 365 Apps for Enterprise
affected:
  - '365_apps_for_enterprise >= 16.0.1 < https://aka.ms/OfficeSecurityReleases'
  - 'office_2019 >= 19.0.0 < https://aka.ms/OfficeSecurityReleases'
  - office_365_for_mac >= 1.0.0 < 16.110.26061317
  - 'office_ltsc_2021 >= 16.0.1 < https://aka.ms/OfficeSecurityReleases'
  - 'office_ltsc_2024 >= 16.0.0 < https://aka.ms/OfficeSecurityReleases'
  - office_ltsc_for_mac_2021 >= 16.0.1 < 16.110.26061317
  - office_ltsc_for_mac_2024 >= 16.0.0 < 16.110.26061317
  - sharepoint_enterprise_server_2016 >= 16.0.0 < 16.0.5556.1005
  - sharepoint_server_2019 >= 16.0.0 < 16.0.10417.20153
  - sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20384
  - word_2016 >= 16.0.1 < 16.0.5556.1000
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-06-10T03:56:17.462457Z'
published: '2026-06-09'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T13:43:41.989Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-45456'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45456'
    label: Microsoft Outlook and Word Remote Code Execution Vulnerability
tags:
  - cve.org
epss: 0.00446
epssPercentile: 0.36041
ingestedAt: '2026-09-24T14:44:21.431Z'
---

## Overview

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

## Affected

- `365_apps_for_enterprise >= 16.0.1 < https://aka.ms/OfficeSecurityReleases`
- `office_2019 >= 19.0.0 < https://aka.ms/OfficeSecurityReleases`
- `office_365_for_mac >= 1.0.0 < 16.110.26061317`
- `office_ltsc_2021 >= 16.0.1 < https://aka.ms/OfficeSecurityReleases`
- `office_ltsc_2024 >= 16.0.0 < https://aka.ms/OfficeSecurityReleases`
- `office_ltsc_for_mac_2021 >= 16.0.1 < 16.110.26061317`
- `office_ltsc_for_mac_2024 >= 16.0.0 < 16.110.26061317`
- `sharepoint_enterprise_server_2016 >= 16.0.0 < 16.0.5556.1005`
- `sharepoint_server_2019 >= 16.0.0 < 16.0.10417.20153`
- `sharepoint_server_subscription_edition >= 16.0.0 < 16.0.19725.20384`
- `word_2016 >= 16.0.1 < 16.0.5556.1000`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.