---
id: CVE-2026-97017
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
  - microsoft_365
  - office_2021
  - office_2024
  - office_online_server < 16.0.10417.20228
patched:
  - office_online_server 16.0.10417.20228
published: '2026-10-13'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T21:19:27.383'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97017'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97017'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
epss: 0.00758
epssPercentile: 0.55013
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-13T19:36:05.206489Z'
ingestedAt: '2026-10-13T19:43:29.291Z'
---

## Overview

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

## Affected

- `365_apps`
- `microsoft_365`
- `office_2021`
- `office_2024`
- `office_online_server < 16.0.10417.20228`

## Remediation

Upgrade past the affected range:

- `office_online_server 16.0.10417.20228`