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Interview question · Application & API Security

Why have so many MongoDB, Elasticsearch and Redis instances been breached or wiped, and how do you deploy them safely?

These breaches rarely involved exploits. Databases built for trusted networks were put on the internet with no password, and automated scripts found them within hours.

easyNewPreparation tags: Amazon, Google, MicrosoftUpdated Nov 2026

These breaches rarely involved exploits. Databases built for trusted networks were put on the internet with no password, and automated scripts found them within hours.

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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.

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What if · the follow-ups in this answer

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

A team spins up Elasticsearch on a cloud VM for logs, with a public IP, so a vendor can access it.

  1. Why are these data stores often exposed?
  2. What has happened to exposed clusters?
  3. What should happen right now?
  4. How should the vendor get access?
  5. How do you prevent recurrence?
  6. What would you require?

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