Auth Intermediate
Password Reset Defense Lab
Secure account recovery against enumeration, token theft, replay, concurrent use, and stale sessions.
- Time
- 7-10 minutes
- Concept
- Secure password reset tokens
Backend concept
Password Reset & Account Recovery
Single-use reset tokens, expiry, hashed storage, session revocation, and enumeration-resistant responses.
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Key takeaway
Single-use reset tokens, expiry, hashed storage, session revocation, and enumeration-resistant responses. Start with the related games below when you want to turn the definition into practice.
Why this matters
Account recovery is an authentication bypass by design and must be protected like a credential issuance flow.
How to practice
Design the token lifecycle and public responses so stolen data and repeated attempts have limited value.
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Start a focused review session for Password Reset & Account Recovery.
Learning objectives
- Prevent account enumeration.
- Store and consume reset tokens safely.
- Close existing access after recovery.
- Separate authentication failures from authorization failures.
- Recognize token expiration, missing scopes, CSRF risk, and session fixation risk.
- Apply object-level authorization instead of trusting a valid token alone.
Common mistakes to avoid
- Returning user-not-found responses.
- Storing raw reset tokens.
- Marking a token used after changing the password.
- Treating a valid JWT signature as permission for every object or action.
- Returning 401 for authenticated users who lack scope or ownership.
- Ignoring CSRF on cookie-authenticated write endpoints.
Games for Password Reset & Account Recovery
Start with the first game, then use local review history to revisit missed decisions.
Auth Intermediate
Auth Token Inspector
Inspect authentication scenarios and choose safe backend decisions for tokens, scopes, sessions, CSRF, and object-level authorization.
- Time
- 6-9 minutes
- Concept
- Authentication, authorization, sessions, and token safety
Scaling Intermediate
Rate Limit Architect
Choose rate limiting designs for realistic backend traffic patterns, from public APIs and login endpoints to queues, webhooks, and retry storms.
- Time
- 6-9 minutes
- Concept
- Rate limiting, fairness, backpressure, and abuse protection