CVE-2026-54130: Microsoft 365 Copilot

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Affected products

• Microsoft 365 Copilot: affected versions not specified

Published 2026-06-18. Last modified 2026-06-25.