We wanted to let the Exchange Server community know that there are no security releases for any version of Exchange Server in May 2026, for customers with Exchange SE, or Exchange 2016 or 2019 ESU.
Please keep upgrading your organizations to Exchange SE.
Update 5/14/2026: While there is no security release (Security Update) in May 2026, please see our later blog post mentioning a mitigation for an Exchange Server CVE disclosed on May 14: Addressing Exchange Server May 2026 vulnerability CVE-2026-42897 | Microsoft Community Hub
The Exchange Team
Updated May 14, 2026
Version 2.0
