CVE-2026-85887

M365 Copilot Information Disclosure Vulnerability

Published Sep 17, 2026 CVSS 3.1 · 7.7 High EPSS < 1% KEV · Not listed
Description
Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:microsoft:365_copilot:-:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.
Title M365 Copilot Information Disclosure Vulnerability
First Time appeared Microsoft
Microsoft 365 Copilot
Weaknesses CWE-732
CPEs cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft 365 Copilot
References
Metrics cvssV3_1

{'score': 7.7, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Nov 10, 2026, 9:38 PM
Reserved
Sep 4, 2026, 6:18 PM
Status
Analyzed
Published
Sep 18, 2026, 12:17 AM
Modified
Sep 28, 2026, 6:37 PM