What are the potential pitfalls of displaying database values directly in HTML input fields using PHP?

Displaying database values directly in HTML input fields using PHP can pose a security risk known as Cross-Site Scripting (XSS) attacks. This can allow malicious users to inject harmful scripts into the input fields, potentially compromising the security of your application. To prevent this, it is recommended to properly sanitize and escape the database values before displaying them in the HTML input fields. 

<?php
// Retrieve database value
$value = $row['column_name'];

// Sanitize and escape the value before displaying in HTML input field
$sanitized_value = htmlspecialchars($value);
?>

<input type="text" name="input_field" value="<?php echo $sanitized_value; ?>">

Keywords

SQL injection cross-site scripting htmlspecialchars htmlentities data validation

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