A majority of Allianz Life's 1.4 million US customers had their personal data stolen in cyber-attack. Here's what you need to know.

Hackers gained access to personal data on the majority of the 1.4 million customers of Allianz Life Insurance Company of North America, the company confirmed Saturday.

Cybersecurity experts suggest that data from the breach could be sold on the dark web, where millions of exposed records fetch value. Victims may start receiving targeted spear-phishing emails or fraudulent calls in the coming weeks.