What potential issues can arise from relying on the HTTP_REFERER variable for determining the current domain?

One potential issue that can arise from relying on the HTTP_REFERER variable for determining the current domain is that it can be easily manipulated or spoofed by malicious users. This can lead to security vulnerabilities such as cross-site request forgery (CSRF) attacks. To mitigate this risk, it is recommended to use server-side validation and verification techniques instead of solely relying on the HTTP_REFERER variable. 

// Validate the current domain by comparing it with the expected domain
$currentDomain = $_SERVER['HTTP_HOST'];
$expectedDomain = 'example.com';

if ($currentDomain !== $expectedDomain) {
    // Handle the case where the current domain does not match the expected domain
    die('Invalid domain');
}

Keywords

HTTP_REFERER variable domain security vulnerability

Related Questions