TL;DR: SQL injection (SQLi) happens when a website builds a database query using user input without cleaning it — so an attacker can sneak in their own SQL and read, change or delete your data, or bypass logins. The fix is to use parameterised queries (prepared statements) so input is always treated as data, never as commands. It's a code-level issue, so as developers we can audit and fix it. Scan your domain free to start.
How SQL injection works
Say a login checks SELECT * FROM users WHERE email='[input]'. If the site drops your input straight into
that string, an attacker can submit something like ' OR '1'='1, turning the query into one that's always true —
logging them in without a password. The same trick can dump entire tables, modify records, or delete data.
Why it's so damaging
- Data theft: customer records, credentials, payment details.
- Authentication bypass: logging in as anyone, including admins.
- Data destruction: altering or deleting records.
- It's been a top web-app vulnerability for two decades and still common in custom and legacy code.
How to prevent it
- Use parameterised queries / prepared statements. This is the real fix — the database treats input as a value, never as SQL.
- Use an ORM or query builder that parameterises by default (but don't defeat it with raw string concatenation).
- Validate and constrain input as defence in depth.
- Least-privilege database accounts so a breach can't do everything.
- Keep frameworks and plugins updated — many SQLi holes come from outdated components.
How Kalenfy fits
SQLi lives in your application code, so a passive DNS scan won't find it — but your free scan flags the surrounding posture (outdated CMS, exposed files), and because we're developers, we can review your code and fix injection flaws. Reply to your report to ask.
FAQ
Is SQL injection the same as XSS?
No — XSS runs scripts in a visitor's browser; SQLi attacks your database. Both stem from trusting unsanitised input.
Does a WAF stop SQL injection?
A web application firewall can block many attempts, but it's a safety net — parameterised queries are the actual fix.
Am I at risk if I use WordPress/a framework?
Core frameworks parameterise by default, but plugins, custom code and raw queries can still introduce SQLi. Keep everything updated and avoid string-built queries.
Worried about injection flaws in your site? Scan your domain, then reply to your report — we're developers and we'll audit and harden the code for you.