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A critical vulnerability (CVE-2025-53786) affects Microsoft Exchange hybrid deployments.
Successful exploitation allows privilege escalation from on-premises Exchange Server to Exchange Online without leaving easily auditable traces. This could result in full compromise of cloud-hosted mailboxes and services.
Microsoft Exchange Server
Affected Version: Exchange Server 2016 CU23
Remediation: Install the latest hotfix for Exchange Server.
Hotfixes available for Exchange Server 2016 CU23, 2019 CU14/CU15, and Subscription Edition RTM
No temporary fixes provided
Isolate Exchange servers from public internet
Run Microsoft Exchange Health Checker
7/28/2025
7/28/2025
No affected organizations specified
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