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function authenticateUser(req, res) { const { username, password } = req.body; const query = `SELECT * FROM users WHERE username = '${username}'`; db.query(query, (err, user) => { if (user && user.password === password) { res.json({ success: true }); } }); }
SQL Injection Vulnerability
String interpolation in SQL query allows attackers to inject malicious code. User input should be parameterized.
const query = 'SELECT * FROM users WHERE username = $1';db.query(query, [username], callback);