This article explores the mechanics of OAuth application attacks within Entra ID, focusing on how threat actors bypass strong authentication by exploiting SaaS session integrity. Through a hypothetical scenario involving a ChatGPT-themed service principal, the research demonstrates how users can be coerced into granting sensitive permissions like Mail.Read. The analysis highlights the specific AuditLogs events—'Consent to application' and 'Add service principal'—required to detect and investigate these malicious consent grants.
The research provides actionable detection strategies tailored to identifying non-admin consent for risky scopes in third-party applications. It further details remediation steps using Microsoft Graph PowerShell to revoke illicit permissions and remove malicious service principals. By balancing security settings and user flexibility, organizations can mitigate the risk of over-provisioned OAuth permissions and unauthorized SaaS access.
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