Read Gradient’s New White Paper: Reviewing the 2023 Microsoft Exchange Online Intrusion

Executive Summary

In the summer of 2023, a threat actor conducted an extensive cyber intrusion targeting Microsoft Exchange Online mailboxes and compromising 22 organizations and over 500 individuals worldwide. This large-scale attack, exploiting a legacy Microsoft key dating back to 2016, underscores the severe risks of stolen credentials and highlights the urgent need for robust credential management and authentication practices.


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