CVE-2026-65801: Microsoft Exchange Online

Critical severity, CVSS 10.0. EPSS: 0.9% chance of exploitation in the next 30 days.

Server-side request forgery (ssrf) in Microsoft Exchange Online allows an unauthorized attacker to elevate privileges over a network.

Affected products

• Microsoft Exchange Online: affected versions not specified

Published 2026-08-20. Last modified 2026-08-24.