---
id: CVE-2026-47645
title: Microsoft 365 Copilot's Business Chat Elevation of Privilege Vulnerability
summary: >-
  Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's
  Business Chat allows an unauthorized attacker to elevate privileges 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/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-601
vendor: Microsoft
product: Microsoft 365 Copilot
affected:
  - 365_copilot -
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-06-23T00:00:00+00:00'
published: '2026-06-19'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T13:45:19.436Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-47645'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47645'
    label: Microsoft 365 Copilot's Business Chat Elevation of Privilege Vulnerability
tags:
  - cve.org
epss: 0.00758
epssPercentile: 0.5375
ingestedAt: '2026-09-24T14:44:21.356Z'
---

## Overview

Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to elevate privileges over a network.

## Affected

- `365_copilot -`

## Remediation

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