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Input Validation: You should always validate the input data to ensure that it meets the expected format and is not malicious. Use regular expressions or third-party libraries to sanitize the input and remove any unwanted characters or symbols.

Encoding: Encoding the user input can prevent XSS attacks. Use HTML encoding to convert characters like <, >, ", ', and & into their corresponding HTML entities like <, >, ", ', and &.

Whitelisting: Create a whitelist of trusted sources and allow only those sources to access the page. This can go a long way to prevent unauthorized access and XSS attacks.

Content Security Policy (CSP): Implementing a Content Security Policy (CSP) can help to prevent XSS attacks. You can set a policy for source origins of scripts, styles, and images. This can also include the configures the use of other security features such as CSP.

Disabling inline scripts: Disabling inline scripts can prevent XSS attacks. Allowing only external scripts and avoiding inline scripts can help to prevent XSS attacks.

Regular updates: Always keep your web applications updated to the latest versions to protect against known vulnerabilities and exploits. This will help you to avoid known exploits and provide timely protection against new attacks.