The US Cybersecurity and Infrastructure Security Agency has warned Microsoft users of a high-severity security vulnerability that requires immediate attention.
, the U.S. Cybersecurity and Infrastructure Security Agency has issued another alert. This time, it impacts users of Microsoft Exchange Server and, without immediate remediation, could enable an attacker to escalate privileges and “impact the identity integrity of an organization’s Exchange Online service.” Here’s what you need to know.
There have been a number of security warnings impacting Microsoft users of late that may have caught your attention: thewarned, “that allows a cyber threat actor with administrative access to an on-premise Microsoft Exchange server to escalate privileges by exploiting vulnerable hybrid-joined configurations.
Although CISA confirmed that there has not been any observed active exploitation of CVE-2025-53786, it strongly urged organizations to follow the Microsoft guidance on this issue.is officially listed as a Microsoft Exchange Server Hybrid Deployment elevation of privilege vulnerability that follows an accompanying non-security hot fix when the hybrid deployments were announced on April 18.
CVE-2025-53786 Microsoft Exchange Server Microsoft Security Warning Microsoft Server Microsoft Exchange CISA Warning
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