---
id: CVE-2026-54988
title: >-
  Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker
  to disclose information locally.
summary: >-
  Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker
  to disclose information locally.
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H'
cwe:
  - CWE-125
vendor: microsoft
product: 365_apps
affected:
  - 365_apps
  - excel = 2016
  - microsoft_365
  - office_2019
  - office_2021
  - office_2024
  - office_online_server < 16.0.10417.20175
patched:
  - office_online_server 16.0.10417.20175
published: '2026-07-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T22:10:00.210'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54988'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54988'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-14T17:46:04.548643Z'
epss: 0.00461
epssPercentile: 0.39794
ingestedAt: '2026-09-08T17:06:31.929Z'
---

## Overview

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

## Affected

- `365_apps`
- `excel = 2016`
- `microsoft_365`
- `office_2019`
- `office_2021`
- `office_2024`
- `office_online_server < 16.0.10417.20175`

## Remediation

Upgrade past the affected range:

- `office_online_server 16.0.10417.20175`