Enviar #821888: code-projects Online Hospital Management System April 15, 2026 SQL Injection

In `login_1.php`, there is a critical SQL injection vulnerability in the Online Hospital Management System. The controllable parameter is `username` (sent via HTTP POST method). This parameter is directly concatenated into a SELECT SQL query without any sanitization or parameterized query protection. Because `login_1.php` is the login handler and does not require prior authentication, the vulnerability can be triggered by **any unauthenticated remote attacker**. A malicious attacker can bypass authentication entirely, log in as any user (including administrators), or extract sensitive data from the database using UNION or blind SQL injection techniques.

**Code analysis**

The vulnerable code resides on line 10 of `login_1.php`:

php

```
$username=$_POST['username'];
$password=$_POST['password'];
$user=$_POST['user'];

$sql="select * from login_user where username='$username'";
$query=mysqli_query($db,$sql);
```

The `$_POST['username']` value is taken directly from the login form and inserted into the SQL query string without any escaping or use of a prepared statement. The application then checks if a row is returned and subsequently validates the password and user role in PHP. However, an attacker can inject malicious SQL code into the `username` field to manipulate the query's logic or retrieve arbitrary data.

• Fuente: ⚠️ https://github.com/Mi0uno/Online-Hospital-Management-System-has-SQL-Injection
• Usuario: mi0034 (UID 80111)
• Sumisión: 2026-05-07 12:10 (hace 28 días)
• Moderación: 2026-05-31 09:01 (24 days later)
• Estado: Aceptado
• Entrada de VulDB: 367487 [code-projects Online Hospital Management System 1.php login_1.php login_user Nombre de usuario inyección SQL]
• Puntos: 20