What are the potential dangers of using the Referer in PHP?

The potential dangers of using the Referer in PHP include the risk of spoofing or manipulation by malicious users. To mitigate this risk, it is recommended to validate and sanitize the Referer data before using it in any sensitive operations. 

// Validate and sanitize the Referer data before using it
$referer = filter_var($_SERVER['HTTP_REFERER'], FILTER_VALIDATE_URL);

if ($referer !== false) {
    // Proceed with using the sanitized Referer data
} else {
    // Handle the case where the Referer data is invalid
}

Keywords

security vulnerability HTTP_REFERER cross-site scripting data leakage

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