---
id: CVE-2025-62554
title: >-
  Access of resource using incompatible type ('type confusion') in Microsoft
  Office allows an unauthorized attacker to execute code locally.
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'
cwe:
  - CWE-843
vendor: microsoft
product: 365_apps
affected:
  - 365_apps
  - 365_copilot
  - office = 2016
  - office = 2019
  - office_long_term_servicing_channel = 2021
  - office_long_term_servicing_channel = 2024
published: '2025-12-09'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T20:10:00.247'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-62554'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62554'
    label: secure@microsoft.com
tags:
  - nvd
epss: 0.00434
epssPercentile: 0.3535
ingestedAt: '2026-09-30T20:23:19.449Z'
---

## Overview

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

## Affected

- `365_apps`
- `365_copilot`
- `office = 2016`
- `office = 2019`
- `office_long_term_servicing_channel = 2021`
- `office_long_term_servicing_channel = 2024`

## Remediation

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