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.

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

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

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"We're moving quickly," Farrah Storr, head of international at Substack, tells THR after hiring Mark Swierszcz as its new Canadian head of partnerships, with more country hires in the works worldwide.

This past March, poet and critic Yanyi was very busy. Between teaching at Dartmouth, editing a literary journal, preparing a forthcoming book, and running a creative advice newsletter called “The ...