Aug 2025: Microsoft Exchange Server Hybrid Deployment Elevation of Privilege Vulnerability
CVE-2025-53786 Published on August 6, 2025
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.
Weakness Type
What is an authentification Vulnerability?
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
CVE-2025-53786 has been classified to as an authentification vulnerability or weakness.
Products Associated with CVE-2025-53786
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Affected Versions
Microsoft Exchange Server Subscription Edition RTM:- Version 15.02.0.0 and below 15.02.2562.017 is affected.
- Version 15.02.0.0 and below 15.02.1748.024 is affected.
- Version 15.01.0.0 and below 15.01.2507.055 is affected.
- Version 15.02.0.0 and below 15.02.1544.025 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.