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Use secure development practices, review the application as per owasp to protect the application.
use NIST/DISA hardening guides to harden the DB, OS and web server.
Get the whole setup pentested by Expert
Hello,
Follow These Steps will help you:-
1. Keep platforms and scripts up-to-date.
2. Install security plugins, when possible.
3. Use HTTPS.
4. Use parameterized queries.
5. Use CSP.
6. Make sure your passwords are secure.
7. Lock down your directory and file permissions
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* Update, Update, Update!
Note:- Don't disclose all these things to the unknown person.
Regards.