Adding CSRF Token is a critical security measure for protecting web applications from unauthorized data submissions from other websites
Install SSL Certificate
Keep all libraries and frameworks up-to-date to avoid vulnerabilities found in older versions.
Limit User Permissions and Access
Always validate user input to protect against common vulnerabilities like SQL injection, cross-site scripting (XSS), and command injection. This should be done both on the client side for user experience and on the server side for security.
Define and enforce a strict CORS policy to prevent unauthorized domains from accessing your resources.
Use captcha
Utilize content security policies to prevent XSS attacks. Escape user input in HTML output to ensure that any input is rendered harmless.
Implement CSP headers to control the sources of various content types and mitigate XSS attacks.
Use X-Frame-Options or Content Security Policy (CSP) to prevent your website from being framed by malicious sites.
Use the Secure and HttpOnly flags for cookies to prevent access by client-side scripts and to ensure they're sent over HTTPS.
Set HTTP headers: "Referrer-Policy": "no-referrer"
Disable iframe embedding
Implement rate limiting and throttling to prevent brute-force attacks.
Regularly conduct security audits and penetration testing to identify and fix vulnerabilities.