---
id: CVE-2026-55946
title: >-
  Improper neutralization of special elements used in a command ('command
  injection') in Microsoft Copilot allows an unauthorized attacker to disclose
  information over a network.
summary: >-
  Improper neutralization of special elements used in a command ('command
  injection') in Microsoft Copilot allows an unauthorized attacker to disclose
  information over a network.
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N'
cwe:
  - CWE-77
vendor: Microsoft
product: Microsoft Copilot
affected:
  - copilot -
published: '2026-09-17'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T13:17:09.417'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55946'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55946'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-19T03:56:40.835292Z'
epss: 0.00688
epssPercentile: 0.50589
ingestedAt: '2026-09-17T23:31:20.683Z'
---

## Overview

Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to disclose information over a network.

## Remediation

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