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SQL Injection Vulnerability in Query
Security review discovers SQL injection vulnerability. Application constructs SQL queries by string concatenation with user input. Attacker could manipulate queries by injecting SQL code through input fields.
Query works correctly for normal input but fails to protect against malicious input.
Error Messages You Might See
SQL Injection vulnerability detected
Malicious SQL detected in query
Security scan failed: parameterization needed
Common Causes
- String concatenation to build SQL: "SELECT * FROM users WHERE name = '" + name + "'"
- Not using prepared statements or parameterized queries
- Insufficient input validation (blacklist instead of parameterization)
- Escape characters not properly handled
- Multi-step query building without parameterization
How to Fix It
Always use parameterized queries/prepared statements. Example: PreparedStatement ps = conn.prepareStatement("SELECT * FROM users WHERE name = ?"); ps.setString(1, name). Use ORM (Hibernate, JPA) which parameterizes by default. Never concatenate user input into SQL strings. Validate input but don't rely on validation alone.
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Get HelpFrequently Asked Questions
What's the danger of string concatenation in SQL?
Attacker enters: ' OR '1'='1 in name field. Query becomes: SELECT * FROM users WHERE name = '' OR '1'='1' (always true, returns all users).