Cross-Site Scripting (XSS) is a type of vulnerability that allows attackers to inject malicious code into web pages viewed by other users. In CodeIgniter, you can prevent XSS attacks by following these steps:
- Use the html_escape() function: This function converts special characters to HTML entities, which helps to prevent XSS attacks. You should use this function on all data that you output to the browser, including data from forms, cookies, and URLs.
- Validate user input: You should always validate user input to ensure that it is safe to use. This can be done using the built-in form validation library or by writing your own validation functions.
- Use the $this->input->get() and $this->input->post() functions: These functions automatically sanitize input data, which helps to prevent XSS attacks.
- Use the xss_clean() function: This function can be used to sanitize data before inserting it into the database.
- Set the global_xss_filtering setting to TRUE: This setting enables the built-in XSS filtering function, which can help to prevent XSS attacks.
By following these steps, you can help to protect your CodeIgniter application from XSS attacks.