CVE-2026-42827: Microsoft 365 Copilot

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Affected products

• Microsoft 365 Copilot: affected versions not specified

Published 2026-05-22. Last modified 2026-07-23.