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

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

Lynch Carpenter is a national class action law firm with offices in Pennsylvania, California, and Illinois. Our firm has represented millions of clients in data privacy matters for more than a decade ...

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

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

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

Forbes contributors publish independent expert analyses and insights. Karin Eldor covers entrepreneurs and leaders in fashion & lifestyle. The momentum hasn’t slowed. Every time I went to hit publish ...

"We're moving quickly," Farrah Storr, head of international at Substack, tells THR after hiring Mark Swierszcz as its new ...

If you have accounts on any of these services, now's a good time to check your security settings. Plus more from a busy week in cybersecurity chaos.

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 ...