Even with a good threat response in place, sensitive information can get stolen. Data breaches happen when a hacker gets data from unauthorized access. Passwords can be read. Data that gets stored in a database can be compromised by SQL injection. Or other types of attacks.
Credit card numbers can be exposed. Likewise with session tokens, healthcare data and bank account numbers.
Websites need to have HTTPS security. And they need to use SSL.
Cybersecurity analysts or a data protection officer can help with access management. High-quality software and other intrusion detection systems are critical.
Finally, don’t forget there’s a NIST Cybersecurity Framework published by the US National Institute of Standards and Technology.