Substack Breach May Have Leaked Nearly 700,000 User Details Online

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

This Substack Data Breach May Have Compromised Nearly 700,000 User Records

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

Substack Hacked — What 50 Million Users Need To Know

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 CEO says AI can drive a slop future or a cultural renaissance

Substack CEO Chris Best says AI could flood feeds with junk — or empower independent creators to spark a cultural renaissance.
Observer

After Shutting His Hedge Fund, Michael Burry Launches a Substack to Speak ‘Freely’ on the A.I. Bubble

Michael Burry attends “The Big Short” New York screening at the Ziegfeld Theater on Nov. 23, 2015 in New York City. Astrid Stawiarz/Getty Images Yesterday (Nov. 23), Burry launched a newsletter on the ...
CPO Magazine

Substack Data Breach Leaks Nearly 700,000 User Records

Publishing platform Substack has disclosed a data breach that leaked nearly 700,000 user records after an unauthorized third-party exploited a security flaw.