CVE-2026-85887: Microsoft 365 Copilot

High severity, CVSS 7.7. EPSS: 0.8% chance of exploitation in the next 30 days.

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

Affected products

• Microsoft 365 Copilot: affected versions not specified

Published 2026-09-18. Last modified 2026-09-28.