---
id: CVE-2026-108440
title: Microsoft Office Word Remote Code Execution Vulnerability
summary: >-
  Stack-based buffer overflow in Microsoft Office Word allows an unauthorized
  attacker to execute code over a network.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-121
vendor: Microsoft
product: Microsoft 365 Apps for Enterprise
affected:
  - '365_apps_for_enterprise >= 16.0.1 < https://aka.ms/OfficeSecurityReleases'
  - office_365_for_mac >= 1.0.0 < 16.114.26101123
  - office_ltsc_2021 >= 16.0.1 < 16.0.14334.20974
  - office_ltsc_2024 >= 16.0.0 < 16.0.17932.21056
  - office_ltsc_for_mac_2021 >= 16.0.1 < 16.114.26101123
  - office_ltsc_for_mac_2024 >= 16.0.0 < 16.114.26101123
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T22:19:55.160Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-108440'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-108440'
    label: Microsoft Office Word Remote Code Execution Vulnerability
tags:
  - cve.org
ingestedAt: '2026-10-15T21:45:11.417Z'
---

## Overview

Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

## Affected

- `365_apps_for_enterprise >= 16.0.1 < https://aka.ms/OfficeSecurityReleases`
- `office_365_for_mac >= 1.0.0 < 16.114.26101123`
- `office_ltsc_2021 >= 16.0.1 < 16.0.14334.20974`
- `office_ltsc_2024 >= 16.0.0 < 16.0.17932.21056`
- `office_ltsc_for_mac_2021 >= 16.0.1 < 16.114.26101123`
- `office_ltsc_for_mac_2024 >= 16.0.0 < 16.114.26101123`

## Remediation

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