Microsoft’s Entra ID: A Comedy of Errors in Security Flaws
Microsoft’s Entra ID tenant had a fatal flaw: actor tokens and a vulnerability that allowed global admin access, opening the door to impersonation and data access without leaving a trace. Security researcher Dirk-jan Mollema discovered this flaw, making the phrase “access denied” a mere suggestion. Microsoft has since patched the issue.
Hot Take:
Well, folks, it seems like Microsoft’s Entra ID had a secret party and forgot to send out the invites—except to every hacker in the world. If you were feeling left out, fear not! Thanks to some sneaky legacy ‘actor tokens’ and a flaw in Azure’s AD Graph API, cybercriminals almost RSVP’d to every company’s sensitive data without leaving a bread crumb trail. Seems like Microsoft’s idea of a ‘secure’ identity management service might need a bit of a makeover, or at least a better bouncer at the door!
Key Points:
– Legacy “actor tokens” and a vulnerability in Azure AD Graph API (CVE-2025-55241) could have allowed global Entra ID tenant access.
– Actor tokens enabled user impersonation without proper logging, revocation, or security controls.
– The flaw allowed potential full tenant compromise, granting unauthorized Global Admin privileges.
– Researcher Dirk-jan Mollema highlighted the issue; Microsoft patched the vulnerability.
– Microsoft plans to phase out the Azure AD Graph API by September 2025.