CVE-2026-21520: Microsoft Copilot Studio

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through network attack vector

Affected products

• Microsoft Copilot Studio: affected versions not specified

Published 2026-01-22. Last modified 2026-06-17.