How Nearly All M365 Tenants Were Exposed to Potential Compromise
A critical vulnerability in Microsoft Entra ID could have allowed attackers to impersonate users across tenants without detection, exploiting the B2B collaboration model and undocumented Actor tokens. The flaw would have enabled exponential compromise across organizations, including Microsoft’s own ecosystem. While the issue was patched, it highlights the ongoing risks of complex identity systems and the need for proactive defenses like MDR, tighter guest access controls, and trusted security partnerships.
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