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SQL injection prevention: Use parameterized queries (prepared statements) 100% of the time. Never concatenate user input into SQL. Use ORM with safe defaults. Validate input types. Escape if parameterization impossible. Use least privilege database accounts. |
Second-order SQL injection: Data stored from first request (signup) is used unsafely in second request (profile view). Mitigation: parameterize ALL queries regardless of data source. Never assume data from database is safe. Input validation alone insufficient. |
NoSQL injection: MongoDB $ne $gt $regex operators. {username: {$ne: ''}, password: {$ne: ''}} bypasses auth. {$where: 'sleep(5000)'} for time-based. Mitigation: validate types $jsonSchema, mongo-sanitize, never pass raw JSON to queries. |
ORM injection risks: ActiveRecord where with string interpolation (unsafe): User.where("name = '#{params[:name]}'"). Safe: User.where(name: params[:name]). Django ORM raw() unsafe, .filter() safe. SQLAlchemy text() unsafe without parameters. |
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