---
id: CVE-2026-96951
title: >-
  Improper neutralization of special elements used in a command ('command
  injection') in Windows Shell allows an unauthorized attacker to bypass a
  security feature over a network.
summary: >-
  Improper neutralization of special elements used in a command ('command
  injection') in Windows Shell allows an unauthorized attacker to bypass a
  security feature 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-77
vendor: microsoft
product: outlook_web
affected:
  - outlook_web
  - windows_10_1607 < 10.0.14393.9612
  - windows_10_1809 < 10.0.17763.9376
  - windows_10_21h2 < 10.0.19044.7807
  - windows_10_22h2 < 10.0.19045.7807
  - windows_11_23h2 < 10.0.22631.7652
  - windows_11_24h2 < 10.0.26100.9711
  - windows_11_25h2 < 10.0.26200.9711
  - windows_11_26h1 < 10.0.28000.3231
  - windows_11_26h2 < 10.0.26300.9711
  - windows_server_2012 = r2
  - windows_server_2016 < 10.0.14393.9612
  - windows_server_2019 < 10.0.17763.9376
  - windows_server_2022 < 10.0.20348.5761
  - windows_server_2025 < 10.0.26100.33650
patched:
  - windows_10_1607 10.0.14393.9612
  - windows_10_1809 10.0.17763.9376
  - windows_10_21h2 10.0.19044.7807
  - windows_10_22h2 10.0.19045.7807
  - windows_11_23h2 10.0.22631.7652
  - windows_11_24h2 10.0.26100.9711
  - windows_11_25h2 10.0.26200.9711
  - windows_11_26h1 10.0.28000.3231
  - windows_11_26h2 10.0.26300.9711
  - windows_server_2016 10.0.14393.9612
  - windows_server_2019 10.0.17763.9376
  - windows_server_2022 10.0.20348.5761
  - windows_server_2025 10.0.26100.33650
published: '2026-10-13'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T17:18:00.760'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-96951'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96951'
    label: secure@microsoft.com
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-96951
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
  - cve.org
  - exploit-available
epss: 0.09813
epssPercentile: 0.95565
kev: true
kevDateAdded: '2026-10-13'
kevDueDate: '2026-10-16'
kevRansomware: false
exploited: true
zeroDay: true
exploitAvailable: true
ssvc:
  exploitation: active
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T22:18:16.873555Z'
ingestedAt: '2026-10-13T19:43:29.285Z'
---

## Overview

Improper neutralization of special elements used in a command ('command injection') in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.

## Affected

- `outlook_web`
- `windows_10_1607 < 10.0.14393.9612`
- `windows_10_1809 < 10.0.17763.9376`
- `windows_10_21h2 < 10.0.19044.7807`
- `windows_10_22h2 < 10.0.19045.7807`
- `windows_11_23h2 < 10.0.22631.7652`
- `windows_11_24h2 < 10.0.26100.9711`
- `windows_11_25h2 < 10.0.26200.9711`
- `windows_11_26h1 < 10.0.28000.3231`
- `windows_11_26h2 < 10.0.26300.9711`
- `windows_server_2012 = r2`
- `windows_server_2016 < 10.0.14393.9612`
- `windows_server_2019 < 10.0.17763.9376`
- `windows_server_2022 < 10.0.20348.5761`
- `windows_server_2025 < 10.0.26100.33650`

## Remediation

Upgrade past the affected range:

- `windows_10_1607 10.0.14393.9612`
- `windows_10_1809 10.0.17763.9376`
- `windows_10_21h2 10.0.19044.7807`
- `windows_10_22h2 10.0.19045.7807`
- `windows_11_23h2 10.0.22631.7652`
- `windows_11_24h2 10.0.26100.9711`
- `windows_11_25h2 10.0.26200.9711`
- `windows_11_26h1 10.0.28000.3231`
- `windows_11_26h2 10.0.26300.9711`
- `windows_server_2016 10.0.14393.9612`
- `windows_server_2019 10.0.17763.9376`
- `windows_server_2022 10.0.20348.5761`
- `windows_server_2025 10.0.26100.33650`