CVE-2025-53786: Microsoft Exchange Server Hybrid Deployment Elevation of Privilege Vulnerability
Microsoft Exchange Server Hybrid Deployment Elevation of Privilege Vulnerability
Other sources
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.
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Implement the configuration changes and guidance described in the April 18th 2025 'Exchange Server Security Changes for Hybrid Deployments' announcement (apply the documented hybrid configuration steps).
Exchange Server (hybrid deployments) Apply guidance from April 18th 2025 announcement = as documented
Event History
Frequently Asked Questions
What is the severity of CVE-2025-53786?
CVE-2025-53786 is classified as an elevation of privilege vulnerability in Microsoft Exchange Server.
How do I fix CVE-2025-53786?
To fix CVE-2025-53786, apply the latest security updates and patches provided by Microsoft for your version of Exchange Server.
Which versions of Exchange Server are affected by CVE-2025-53786?
CVE-2025-53786 affects Microsoft Exchange Server 2019, Exchange Server Subscription Edition RTM, and Exchange Server 2016.
What kind of attack can exploit CVE-2025-53786?
CVE-2025-53786 can be exploited to gain elevated privileges on a vulnerable Exchange Server installation.
Is CVE-2025-53786 related to Hybrid Deployments?
Yes, CVE-2025-53786 specifically addresses vulnerabilities in Hybrid Deployments of Microsoft Exchange Server.