A few quotes.
One admin account.
A payload in the username field is enough to rewrite the SQL query. Password verification disappears. The attacker logs in as admin without knowing a single credential.
A standard login form
The application's front door, with a username and password
Every input field is an attack surface
Login forms, search bars, filters, URL parameters... anywhere a user value is passed to a database. If the code directly concatenates the input into the SQL query, the flaw exists by construction.
Key figures
#0
OWASP Top 10
Injection · A03:2021
≤ 0 min
To exploit
a vulnerable endpoint
0%
Of vulnerable apps
that concatenate input
0 line
To fix
with a parameterized query
Technical demo
Try it yourself
This simulation lets you inject a real SQL payload and watch the generated query live. Intended for technical teams and trainers.
SQL Injection
Login bypassed via payload
Generated SQL:
SELECT * FROM users WHERE email = '' AND password = '';
Authentication payload
' OR '1'='1' --
This string forces the condition to true, bypassing authentication if the query isn't parameterized.
Why it's critical
Here, the application directly uses the entered values to build a SQL query. An attacker can alter the query and log in as another user.
For a decision-maker, this means sensitive data can be exposed without the code ever knowing it was manipulated.
How to protect against it
- Never concatenate user text into a SQL query.
- Use parameterized queries.
- Validate and normalize inputs.
- Restrict database account permissions.
SELECT * FROM users WHERE email = $1 AND password = $2; -- bound values, no concatenation