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

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

Substack, a creator-focused subscription and publishing platform, has suffered a data breach affecting an unknown number of creators and subscribers on its platform. The company confirmed the incident ...

Newsletter platform Substack has admitted that an intruder swiped user contact details months before the company noticed, forcing it to warn writers and readers that their email addresses and other ...

The company has emailed affected users after a dark web source claims the data of almost 700,000 users was compromised. Substack, a high-profile publishing platform widely used by academics, ...

Substack is notifying some users that the email addresses and phone numbers linked to their accounts were exposed in a “security incident” last year. In an email to account holders, Substack CEO Chris ...