---
id: CVE-2026-85887
title: >-
  Incorrect permission assignment for critical resource in M365 Copilot allows
  an authorized attacker to disclose information over a network.
summary: >-
  Incorrect permission assignment for critical resource in M365 Copilot allows
  an authorized attacker to disclose information over a network.
severity: high
cvss: 7.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N'
cwe:
  - CWE-732
vendor: Microsoft
product: Microsoft 365 Copilot
affected:
  - 365_copilot -
published: '2026-09-18'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T15:17:14.920'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85887'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85887'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T13:35:20.282568Z'
epss: 0.00859
epssPercentile: 0.56657
ingestedAt: '2026-09-17T23:31:20.692Z'
---

## Overview

Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.

## Remediation

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