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Cybersecurity & InfoSec Interview Questions & Answers

Application security, penetration testing, cryptography, network defense, and OWASP Top 10 mitigation.

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Why do parameterized queries prevent SQL injection more reliably than escaping user input?

Parameterized queries send values separately from the SQL statement structure, so a malicious value is interpreted as data rather than executable SQL syntax. Escaping depends on database, encoding, an...

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How do XSS and CSRF differ, and what controls address each?

Cross-site scripting runs attacker-controlled script in a trusted application’s browser context, often through unsafe rendering. Use context-appropriate output encoding, safe DOM APIs, sanitization fo...

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A user changes an invoice ID in the URL and sees another customer’s invoice. What failed?

The application has an object-level authorization failure: it accepted an identifier without confirming the requester may access that specific invoice. Query within the authenticated user’s permitted ...

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What would you do first after discovering an exposed production API key in a public repository?

Treat the key as compromised and promptly revoke or rotate it through the service’s supported process, coordinating dependent services to avoid unnecessary disruption. Review access logs for misuse, i...

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