Researcher Finds Entra ID Weakness That Could Have Granted Global Admin Access

Two critical weaknesses recently came to light in Microsoft’s Entra ID platform could have given attackers unprecedented control over nearly every Azure cloud customer. The flaws were discovered and reported responsibly, allowing Microsoft to release fixes before attackers were able to exploit them.

Entra ID, previously known as Azure Active Directory, is the identity management system that controls how users log in, what resources they can reach, and who has administrator rights. It is a core service for businesses worldwide, which means any failure in its security could ripple across countless organizations at once.

Dutch security researcher Dirk-jan Mollema, who specializes in cloud identity security, identified the flaws while preparing material for a cybersecurity conference. What he found was alarming: the two vulnerabilities, when combined, created a path for attackers to impersonate users and escalate privileges to the highest level, effectively granting full control of customer environments.

The first weakness involved so-called “Actor Tokens,” a type of authentication token issued by an old Microsoft system known as Access Control Service. These tokens carried unusual privileges that, on their own, posed little risk but became dangerous when chained with a second issue. That second vulnerability was buried in

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