---
id: CVE-2026-62870
title: >-
  Use after free in Microsoft Office Excel allows an unauthorized attacker to
  execute code over a network.
summary: >-
  Use after free in Microsoft Office Excel 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'
cwe:
  - CWE-416
vendor: microsoft
product: 365_apps
affected:
  - 365_apps
  - excel = 2016
  - office_2019
  - office_2021
  - office_2024
published: '2026-08-04'
updated: '2026-08-09'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-62870'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62870'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
epss: 0.0063
epssPercentile: 0.48826
ingestedAt: '2026-08-09T14:33:31.699Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-04T00:00:00+00:00'
---

## Overview

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

## Affected

- `365_apps`
- `excel = 2016`
- `office_2019`
- `office_2021`
- `office_2024`

## Remediation

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