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.

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 ...

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 ...

Since launching in 2017, Substack has emerged as a publishing platform for writers looking to monetize their work through paid newsletters. However, as the platform has grown, so has its content. In ...

Posts from this topic will be added to your daily email digest and your homepage feed. Substack’s founders responded to the change by calling it “a reminder of why writers deserve a model that puts ...

WordPress.com is taking on Substack and others with today’s news that its Newsletter product will now support paid subscriptions and premium content. First launched in December, WordPress.com ...

The newsletter-hosting site Substack advertises itself as the last, best hope for civility on the internet—and aspires to a bigger role in politics in 2024. But just beneath the surface, the platform ...

Forbes contributors publish independent expert analyses and insights. Kristen Bousquet is an influencer and creator monetization coach. Substack is a subscription-based platform that allows writers, ...