Skip to content
AI Security

Interview question · Identity, OAuth & Access Control

Walk through redirect URI validation, state, mix-up attacks, and what current OAuth security best practice requires.

Most OAuth breaches come from a few well-known mistakes. The scored answer explains each attack and the specific rule that stops it, as consolidated in the 2025 OAuth security best current practice.

hardNewPreparation tags: Google, Microsoft, AppleUpdated Nov 2026

Most OAuth breaches come from a few well-known mistakes. The scored answer explains each attack and the specific rule that stops it, as consolidated in the 2025 OAuth security best current practice.

Make your first attempt

What would you say before reading the answer?

  1. 01 State the assumptions your answer depends on.
  2. 02 Explain the mechanism and choose a control.
  3. 03 Name a condition that would change your decision.

The worked answer includes an approach, scoring criteria and follow-up questions. Compare the reasoning with your own.

10 answers per topic instead of 5, plus saved progress and bookmarks · costs nothingor unlock all 529 remaining answers · $25

Every worked answer in all 17 topics, every lesson in every course, the full concept curriculum, the complete practice-test bank, and the downloadable security field guides.

6 months · One payment · No auto-renewal

What if · the follow-ups in this answer

The answer works through 6 follow-ups like an interviewer would

A web app uses OAuth login with an external provider and supports a second provider for enterprise customers.

  1. What does loose redirect URI matching allow?
  2. What happens without state or PKCE?
  3. What is a mix-up attack?
  4. What if tokens are stored in browser localStorage?
  5. What about overly broad scopes?
  6. How would you harden the OAuth integration?

Each rung has a nudge, a model answer, the principle that carries over and the weak answer to avoid. Premium opens every answer and ladder.

UP NEXT ON YOUR JOURNEY
Next in this trackHow do SAML single sign-on and Kerberos work at a high level, and where is trust anchored?Next in this trackIn cloud IAM, how do privilege escalation paths form, and how do you find and close them?Next in this trackWhat are sender-constrained tokens, such as DPoP and mutual TLS binding, and when are they worth it?
DISCUSSION · 0

No comments yet. Share a correction or a different way to answer it.