Part 148: SQL Injection Defense: Parameterized Queries

SQL Injection remains one of the most critical vulnerabilities in cybersecurity.

1. The Vulnerability: String Concatenation

// ❌ FATAL VULNERABILITY: If user inputs "' OR '1'='1"
const query = `SELECT * FROM users WHERE email = '${userInput}'`;

2. The Solution: Prepared Statements & Parameters

//  100% IMMUNE: Parameter is treated strictly as data, never executable code!
const query = 'SELECT * FROM users WHERE email = $1';
await db.query(query, [userInput]);

Key Takeaways

• Never concatenate raw user input into SQL strings. Always use parameterized prepared statements.

In Part 149, we explore Backup, Restore & Point-in-Time Recovery (PITR)!