CVE-2026-58617: Microsoft 365 Copilot

Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days.

Improper access control in Microsoft 365 Copilot for iOS allows an unauthorized attacker to elevate privileges over a network.

Affected products

• Microsoft 365 Copilot: before 2.111.4 (fixed in 2.111.4)

Published 2026-07-14. Last modified 2026-07-16.