Substack has informed some users that their email addresses and phone numbers were compromised in a security breach last October. The company detected the issue on February 3rd and claims no financial information was accessed. Users are advised to be cautious of suspicious communications.

A significant data breach at Lotte Card has exposed personal information of over 1 million users, with estimates suggesting the leak could impact several million. The Financial Supervisory Service's investigation revealed the breach was much larger than the initially reported 1.7 GB. Lotte Card is set to apologize and announce response measures on the 18th.