---
id: CVE-2023-35311
title: Microsoft Outlook Security Feature Bypass Vulnerability
summary: Microsoft Outlook Security Feature Bypass Vulnerability
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-367
vendor: microsoft
product: 365_apps
affected:
  - 365_apps
  - office = 2019
  - office_long_term_servicing_channel = 2021
  - outlook = 2013
  - outlook = 2016
published: '2023-07-11'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T18:17:11.453'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-35311'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311'
    label: secure@microsoft.com
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-35311
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - in-the-wild
  - exploit-available
  - kev
exploited: true
exploitAvailable: true
ssvc:
  exploitation: active
  automatable: 'no'
  technicalImpact: total
  timestamp: '2025-02-04T17:53:50.345525Z'
epss: 0.15522
epssPercentile: 0.96728
kev: true
kevDateAdded: '2023-07-11'
kevDueDate: '2023-08-01'
kevRansomware: false
zeroDay: true
ingestedAt: '2026-10-07T18:42:20.875Z'
---

## Overview

Microsoft Outlook Security Feature Bypass Vulnerability

## Affected

- `365_apps`
- `office = 2019`
- `office_long_term_servicing_channel = 2021`
- `outlook = 2013`
- `outlook = 2016`

## Remediation

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