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.

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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 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 recipient detailed the alleged exchange in a story published on The Underground Bunker ...

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 ...