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.

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

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

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.

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 ...

The most popular writers on Substack earn up to seven figures each year primarily by persuading readers to pay for their work. The newsletter platform’s subscription-driven business model offers ...

Substack has been used by writers as a platform to share their work and ideas with the world, with the opportunity to acquire a following or subscribers. Writers use it to share recipes, stories, ...

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