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

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

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.

Well, shit. I had several Substack subscriptions that I enjoyed. However, continuing to read those subscriptions would be like continuing to go to a Nazi bar because there are some entertaining ...

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 ...

If you have accounts on any of these services, now's a good time to check your security settings. Plus more from a busy week ...

The popular blogging platform Substack – used by numerous British comic creators to promote their work – has suffered a data ...

Forbes contributors publish independent expert analyses and insights. Kristen Bousquet is an influencer and creator monetization coach. Substack is a subscription-based platform that allows writers, ...

Jim Acosta, the former CNN anchor known for antagonizing President Donald Trump during his first term, did not know what Substack was two months ago, when he was suddenly on the outs with the network ...

I dunno about "decrease", but more liberals used to hold up the Voltairian* ideal of "I disapprove of what you say, but I will defend to the death your right to say it." It's how we distinguished ...

The company has emailed affected users after a dark web source claims the data of almost 700,000 users was compromised.