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

The hacker claims to have stolen nearly 700,000 Substack user records, including email addresses and phone numbers.

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

Newsletter platform Substack has confirmed it suffered a security incident, leading to the compromise of users’ email addresses and phone numbers. Chris Best, the CEO of Substack, notified users of ...

The digital publishing platform Substack has told some of its users that their data was stolen in a security breach. The ...