---
id: CVE-2026-100208
title: >-
  Integer overflow or wraparound in Microsoft Office Outlook allows an
  unauthorized attacker to execute code over a network.
summary: >-
  Integer overflow or wraparound in Microsoft Office Outlook allows an
  unauthorized attacker to execute code over a network.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-190
vendor: Microsoft
product: Microsoft 365 Apps for Enterprise
affected:
  - '365_apps_for_enterprise >= 16.0.1 < https://aka.ms/OfficeSecurityReleases'
  - 'office_ltsc_2021 >= 16.0.1 < https://aka.ms/OfficeSecurityReleases'
  - 'office_ltsc_2024 >= 16.0.0 < https://aka.ms/OfficeSecurityReleases'
published: '2026-09-25'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T04:17:33.933'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100208'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-100208'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-25T20:03:40.911478Z'
ingestedAt: '2026-09-25T20:17:49.417Z'
---

## Overview

Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

## Remediation

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