CVE-2025-59249: Microsoft Exchange Server

High severity, CVSS 8.8. EPSS: 0.8% chance of exploitation in the next 30 days.

Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Affected products

• Microsoft Exchange Server: version 2016 only; version 2019 only
• Microsoft Exchange Server Subscription Edition: before 15.02.2562.029 (fixed in 15.02.2562.029)

Published 2025-10-14. Last modified 2026-06-17.