CVE-2026-80098: Microsoft Copilot Studio

Critical severity, CVSS 10.0. EPSS: 0.5% chance of exploitation in the next 30 days.

Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a network.

Affected products

• Microsoft Copilot Studio: affected versions not specified

Published 2026-09-03. Last modified 2026-09-08.