CVE-2026-62911: Microsoft Exchange Server

High severity, CVSS 8.0. EPSS: 0.7% chance of exploitation in the next 30 days.

Authentication bypass by capture-replay 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 15.02.2562.046 (fixed in 15.02.2562.046)

Published 2026-08-11. Last modified 2026-09-02.