Defesas contra XSS, CSRF e injeção de SQL

Most web breaches come from three classics: XSS, CSRF, and SQL injection. The good news is Django defends against all three when you use it normally. 🛡️

XSS happens when attacker-supplied text is rendered as live HTML or script in another user's browser, letting it steal data or hijack the page.

Django's template engine auto-escapes variables, turning dangerous characters into safe entities. A script in user input renders as harmless text, not code.

The safe filter and mark_safe turn escaping off. Only use them on content you fully trust, or you reopen the XSS door yourself.

CSRF tricks a logged-in user's browser into submitting a hidden request to your site, performing actions they never intended, like changing a password.

Django blocks this with a secret CSRF token tied to each session. A forged form from another site cannot include the right token, so the POST is rejected.

Drop the csrf_token tag inside every POST form. Django injects the hidden field and verifies it on submit, all automatically.

SQL injection sneaks malicious SQL into a query through user input, letting an attacker read, change, or delete data they should never touch.

Using the ORM keeps you safe by default. It parameterizes values, so user input is treated as data, never as executable SQL.

If you must write raw SQL, never glue input into the string. Pass values as parameters so the driver escapes them safely for you.

For defense in depth against XSS, a Content Security Policy tells browsers which scripts may run. It limits damage even if bad markup slips through.

Template auto-escaping, the CSRF token, and the parameterized ORM shut down XSS, CSRF, and SQL injection. Stay on the defaults and you stay safe. 🙌