Instead of inserting the URL variable directly into your SQL query, use "parameterized queries." This treats the input as literal text rather than executable code. Input Validation: Ensure the
One of the most frequently discussed and misunderstood search queries in this domain is inurl:index.php?id= .
: The query parameter used to fetch a specific record (like a post ID). Creating a Simple "Create Post" PHP Script inurl index.php%3Fid=
If you are a website owner or developer, you might assume your site is safe. However, if your website logs contain frequent requests to index.php with random strings following the id= parameter, you are being scanned.
This article is written from a cybersecurity and technical SEO perspective, intended for website owners, developers, and security researchers. Instead of inserting the URL variable directly into
$id = $_GET['id']; $stmt = $conn->prepare("SELECT * FROM users WHERE id = ?"); $stmt->bind_param("i", $id); // The "i" forces the input to be an integer. $stmt->execute();
The vulnerability typically arises in PHP applications that use a URL structure like index.php?id=[some_value] , where the id parameter is used to retrieve data from a database. If the application doesn't properly validate or escape the user-input data, an attacker can inject malicious SQL code by adding it to the id parameter. Creating a Simple "Create Post" PHP Script If
A hacker using the inurl:index.php%3Fid= search term finds your site. They then manually modify the URL in their browser to:
An attacker finding this URL will alter the parameter to see how the database responds. They might change index.php?id=5 to index.php?id=5' (adding a single quote).
(if using MongoDB)
They use a UNION SELECT statement to pull data from system tables. index.php?id=-1 UNION SELECT 1, database(), user(), 4--