Substack data breach exposed user email addresses and phone numbers for months before CEO Chris Best confirmed the October ...

Substack states that the security flaw has now been fixed and that a full investigation is underway. There are currently no ...

Substack, the hugely popular online content platform with 50 million active subscribers, has confirmed it has been hacked. Here’s what you need to know.

700,000 records isn't the same as 700,000 users: Each record is something like an email address or a phone number, which ...

Substack said that customer data was accessed in October 2025, but wasn't discovered until early February.