What are some potential security risks associated with not storing Captcha solutions on the server side in PHP?

Storing Captcha solutions on the client side in PHP can pose a security risk as it allows malicious users to easily access and manipulate the solutions. To mitigate this risk, it is recommended to store the Captcha solutions on the server side, where they are more secure and less susceptible to tampering. 

// Server-side Captcha solution storage
session_start();
$_SESSION['captcha_solution'] = $captcha_solution;

Keywords

Captcha security risks server side PHP solutions

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