Cross-tenant token attacks are now harder in Azure AD
Read OriginalThe article details a security improvement in Azure AD that makes cross-tenant token attacks harder. Previously, an app from one tenant could acquire an access token for an API in another tenant, potentially leading to unauthorized access if permissions weren't validated. Now, both v1 and v2 endpoints block token acquisition unless a service principal for the app exists in the target tenant, though the author emphasizes that APIs must still check token permissions.
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