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          "content": "This login query is vulnerable: `query = \"SELECT * FROM users WHERE name = '\" + username + \"'\"`. Show me the fixed version using parameterized queries and explain briefly why the original is exploitable, so my team stops writing these."
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              "content": "# The Vulnerability\n\n```python\nquery = \"SELECT * FROM users WHERE name = '\" + username + \"'\"\n```\n\nThe string is concatenated directly into the SQL, so the query's meaning can be changed by the input.\n\n**Exploit example** — if `username` is:\n\n```\n' OR '1'='1\n```\n\nthe final query becomes:\n\n```sql\nSELECT * FROM users WHERE name = '' OR '1'='1'\n```\n\nThe condition is always true, so the attacker gets back every user — typically the first row, often an admin. Worse, with stacked queries or UNION attacks, this can escalate to data exfiltration or auth bypass. Input like `'; DROP TABLE users; --` shows the classic destructive case (in DBAPIs that allow multiple statements).\n\n# The Fix: Parameterized Queries\n\n**Python (sqlite3, psycopg2, mysql-connector — same pattern everywhere):**\n\n```python\nquery = \"SELECT * FROM users WHERE name = %s\"\ncursor.execute(query, (username,))\n```\n\nNote: use the DB driver's placeholder (`%s`, `?`, `:name` depending on driver), **not** Python string formatting. This is wrong:\n\n```python\ncursor.execute(\"SELECT * FROM users WHERE name = '%s'\" % username)  # still vulnerable\ncursor.execute(f\"SELECT * FROM users WHERE name = '{username}'\")    # still vulnerable\n```\n\n**Other common examples:**\n\n```java\n// Java (JDBC)\nPreparedStatement ps = conn.prepareStatement(\"SELECT * FROM users WHERE name = ?\");\nps.setString(1, username);\n```\n\n```javascript\n// Node.js (pg)\nconst res = await pool.query('SELECT * FROM users WHERE name = $1', [username]);\n```\n\n```csharp\n// C# (ADO.NET)\nvar cmd = new SqlCommand(\"SELECT * FROM users WHERE name = @name\", conn);\ncmd.Parameters.AddWithValue(\"@name\", username);\n```\n\n# Why Parameterization Works\n\nThe SQL and the data are sent to the database **separately**. The query is parsed/compiled first, with the placeholder treated as a literal value — user input can never alter the query's structure. `' OR '1'='1` just becomes a string to search for, and no rows match it.\n\n# Team Rules\n\n1. **Never build SQL with string concatenation, `%` formatting, or f-strings** containing user input — no exceptions.\n2. **Parameterize everything**, including values in `ORDER BY`/`LIMIT` if possible; for identifiers that can't be parameterized, validate against a strict whitelist.\n3. Keep parameters for **values only** — table/column names need whitelisting or an ORM's safe identifier quoting.\n4. Consider an ORM (SQLAlchemy, Django ORM) so devs write raw SQL less often.\n\nAlso worth doing: least-privilege DB accounts, and code review/lint rules (e.g., `bandit` flags raw SQL string building in Python).",
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