---
id: CVE-2026-63527
title: Microsoft Office Word Remote Code Execution Vulnerability
summary: >-
  Stack-based buffer overflow in Microsoft Office Word allows an unauthorized
  attacker to execute code locally.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/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_2019 >= 19.0.0 < https://aka.ms/OfficeSecurityReleases'
  - office_365_for_mac >= 1.0.0 < 16.112.26081010
  - '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 < 16.112.26081010
  - office_ltsc_for_mac_2024 >= 16.0.0 < 16.112.26081010
  - word_2016 >= 16.0.1 < 16.0.5565.1000
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-12T03:59:41.002282Z'
published: '2026-08-11'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T16:26:04.484Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-63527'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63527'
    label: Microsoft Office Word Remote Code Execution Vulnerability
tags:
  - cve.org
epss: 0.00303
epssPercentile: 0.2319
ingestedAt: '2026-09-08T18:07:34.890Z'
---

## Overview

Stack-based buffer overflow in Microsoft Office Word 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 < 16.112.26081010`
- `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 < 16.112.26081010`
- `office_ltsc_for_mac_2024 >= 16.0.0 < 16.112.26081010`
- `word_2016 >= 16.0.1 < 16.0.5565.1000`

## Remediation

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