Challenges → API Security

Mass Assignment

Medium 200 pts 🚩 0 solves ⏱ Avg. time to solve: 7h 50m

Challenge Question

This API's registration endpoint accepts a JSON body and builds the new user record straight from whatever fields you send it, with no filtering and no whitelist. See what happens if you include a field the signup form was never designed to expose.
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Details

  • CategoryAPI Security
  • Authoradmin
  • AddedJul 4, 2026
  • Avg. Time to Solve7h 50m
  • First Blood🩸 prompt_inject

Recent Solvers

  • prompt_inject Jul 4, 2026
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