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

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

Substack won't share official numbers, but it seems like a pretty significant data breach.

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 ...

Substack, a newsletter platform, has confirmed a data breach compromising user email addresses and phone numbers ...

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

If you’re impacted by the security incident, you’ll hear directly from the brand with an email from Substack's CEO.

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

The company has emailed affected users after a dark web source claims the data of almost 700,000 users was compromised.

Substack, the hugely popular online content platform with 50 million active subscribers, has confirmed it has been hacked.

Contact details were accessed in an intrusion that went undetected for months, the blogging outfit says Newsletter platform Substack has admitted that an intruder swiped user contact details months ...

Substack confirms a major data breach exposing user emails and phone numbers. What’s behind the breach, and what’s next?