---
id: CVE-2026-78501
title: >-
  Improper neutralization of special elements used in a command ('command
  injection') in Microsoft 365 Copilot's Business Chat allows an unauthorized
  attacker to disclose information over a network.
summary: >-
  Improper neutralization of special elements used in a command ('command
  injection') in Microsoft 365 Copilot's Business Chat allows an unauthorized
  attacker to disclose information over a network.
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N'
cwe:
  - CWE-77
  - CWE-923
vendor: Microsoft
product: Microsoft 365 Copilot's Business Chat
affected:
  - 365_copilot_s_business_chat -
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T15:17:13.427'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78501'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78501'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T14:11:07.081015Z'
epss: 0.00487
epssPercentile: 0.40898
ingestedAt: '2026-09-17T23:31:20.686Z'
---

## Overview

Improper neutralization of special elements used in a command ('command injection') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to disclose information over a network.

## Remediation

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