How do I prevent SQL injection, NoSQL injection and SSRF?
Understand the concept
Injection occurs when untrusted data becomes part of a command's structure rather than remaining data. SSRF occurs when the server's network access is used to reach an unintended destination. These attacks bypass simple “is this input present?” checks because apparently valid strings or objects can still cause unauthorized behavior.
Important ideas
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SQL: bind data as parameters and allowlist dynamic column names.
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NoSQL: accept expected types and fields; do not use a raw request object as a query.
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SSRF: restrict outbound hosts, ports, redirects and resolved IP addresses.
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Allowlist dynamic sort fields and query operators; parameter binding protects values, not arbitrary identifiers or permissions.
Can you explain it without the notes?
How do I prevent SQL injection, NoSQL injection and SSRF?
Use your own words. Explain an example and one limitation before checking the explanation.
Check your explanation
Injection occurs when untrusted data becomes part of a command's structure rather than remaining data. SSRF occurs when the server's network access is used to reach an unintended destination. These attacks bypass simple “is this input present?” checks because apparently valid strings or objects can still cause unauthorized behavior.
Turn this concept into a clear answer.
- Apply controls at execution boundaries—query construction and outbound connections—not only at form validation.
Keep connecting the ideas.
Next lesson: What are least privilege, TLS and secure headers?Adapted from 08_PERFORMANCE_SECURITY.md · “How do I prevent SQL injection, NoSQL injection and SSRF?”. Examples are study fragments; framework behavior can depend on your version.