Substack won't share official numbers, but it seems like a pretty significant data breach.
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.
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 ...
Substack’s move into comic book publishing went about as well as Marvel’s 2017 decision to make Captain America a Nazi. A big reason why: Nick Spencer, the same controversial comics writer who penned ...
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