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.

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.

Exclusive: Site takes a cut of subscriptions to content that promotes far-right ideology, white supremacy and antisemitism ...

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

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

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 ...

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.

This past March, poet and critic Yanyi was very busy. Between teaching at Dartmouth, editing a literary journal, preparing a forthcoming book, and running a creative advice newsletter called “The ...

The “High Maintenance” co-creator and star Ben Sinclair delves into his complicated relationship with marijuana in a new Substack called “Low Maintenance.” ...