What are the risks associated with modifying browser user agents in PHP scripts?

Modifying browser user agents in PHP scripts can lead to security risks such as allowing malicious users to impersonate legitimate users or gain unauthorized access to sensitive information. To mitigate this risk, it is important to validate and sanitize user input, including the user agent string, before using it in your PHP scripts. 

// Validate and sanitize the user agent string
$userAgent = filter_input(INPUT_SERVER, 'HTTP_USER_AGENT', FILTER_SANITIZE_STRING);

// Use the sanitized user agent string in your PHP script
echo "User Agent: " . $userAgent;

Keywords

browser user agents modifying risks PHP scripts security vulnerabilities

Related Questions