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Interview question · Application & API Security

Why are browser extensions a supply-chain risk, and how would you control them across a company's browsers?

An extension with 'read and change all your data on all websites' sits inside every session your staff open, and it updates itself. The scored answer treats extensions like software you deploy, because they are.

mediumNewPreparation tags: Google, Microsoft, CrowdStrikeUpdated Nov 2026

An extension with 'read and change all your data on all websites' sits inside every session your staff open, and it updates itself. The scored answer treats extensions like software you deploy, because they are.

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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 4 follow-ups like an interviewer would

Threat intelligence reports that a popular productivity extension, approved for all staff in your company two years ago, pushed a malicious update yesterday that sends page content and cookies from certain SaaS sites to an external server.

  1. What do you do first?
  2. How do you scope the damage?
  3. What would have limited this?
  4. How do you summarise browser extension risk?

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.

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