Substack says hackers accessed user emails, phone numbers, and internal metadata in October 2025, with a database of 697,313 records later posted online.

Substack won't share official numbers, but it seems like a pretty significant data breach.

Substack data breach exposed user email addresses and phone numbers for months before CEO Chris Best confirmed the October ...

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According to The Guardian, several newsletters promoting Nazi ideology and antisemitic conspiracy theories were operating on ...

Substack, the hugely popular online content platform with 50 million active subscribers, has confirmed it has been hacked. Here’s what you need to know.

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

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 ...