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.

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

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