Microsoft Releases Guidance on High-Severity Vulnerability (CVE-2025-53786) in Hybrid Exchange Deployments

Source: All CISA Advisories | Added:

CISA has issued an alert regarding a high-severity vulnerability, CVE-2025-53786, that allows privilege escalation in hybrid-joined Microsoft Exchange configurations. Organizations are urged to follow Microsoft's guidance to mitigate potential risks to their Exchange Online service.

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Impact: Microsoft Exchange Server

In the Wild: No

Age: Newly disclosed

Remediation: Implement Microsoft’s Exchange Server Hybrid Deployment Elevation of Privilege Vulnerability guidance, install April 2025 Exchange Server Hotfix Updates, and review Service Principal Clean-Up Mode.

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