Description
On April 18th 2025, Microsoft announced Exchange Server Security Changes for Hybrid Deployments and accompanying non-security Hot Fix. Microsoft made these changes in the general interest of improving the security of hybrid Exchange deployments. Following further investigation, Microsoft identified specific security implications tied to the guidance and configuration steps outlined in the April announcement. Microsoft is issuing CVE-2025-53786 to document a vulnerability that is addressed by taking the steps documented with the April 18th announcement. Microsoft strongly recommends reading the information, installing the April 2025 (or later) Hot Fix and implementing the changes in your Exchange Server and hybrid environment.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23
15.01.0.0 to < 15.01.2507.055affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 14
15.02.0.0 to < 15.02.1544.025affected
Microsoft Microsoft Exchange Server 2019 Cumulative Update 15
15.02.0.0 to < 15.02.1748.024affected
Microsoft Microsoft Exchange Server Subscription Edition RTM
15.02.0.0 to < 15.02.2562.017affected