CVE-2026-85887 HIGH

CVE-2026-85887: M365 Copilot Information Disclosure Vulnerability

Vendor Microsoft
Product Microsoft 365 Copilot
Weakness CWE-732
Published September 17, 2026
Last update September 29, 2026
View on NVD All CVEs

CVSS base score

7.7/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

September 17, 2026 CVE published
September 29, 2026 Record updated