What are the potential security implications of allowing external server access in PHP scripts?

Allowing external server access in PHP scripts can pose security risks such as exposing sensitive data, allowing for remote code execution, and potential injection attacks. To mitigate these risks, it is important to validate and sanitize all input from external servers before processing it in the script. 

// Validate and sanitize input from external server
$external_data = $_GET['data'];
$validated_data = filter_var($external_data, FILTER_SANITIZE_STRING);

// Proceed with processing the validated data
// ...

Keywords

SQL injection cross-site scripting remote code execution file inclusion vulnerability data leakage.

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