Substack says hackers accessed user emails, phone numbers, and internal metadata in October 2025, with a database of 697,313 ...

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.

Publishing platform Substack has disclosed a data breach that leaked nearly 700,000 user records after an unauthorized third-party exploited a security flaw.

Substack CEO Chris Best says AI could flood feeds with junk — or empower independent creators to spark a cultural renaissance.