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.
SecurityWeek

Substack Discloses Security Incident After Hacker Leaks Data

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

Substack confirms data breach affects users’ email addresses and phone numbers

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

Substack Suffers Data Breach, Users’ Emails And Phone Numbers Compromised

Substack confirms a major data breach exposing user emails and phone numbers. What’s behind the breach, and what’s next?
Mashable

Substack failed to register a URL. It allowed me to receive their private emails.

The Wall Street Journal. TechCrunch. Vice. These are just a handful of the media outlets who reached out to me earlier this year for comment in their stories. However, they weren't actually looking ...
New York Post

Substack signs ex-Forbes writer as it seeks to disrupt book publishing

Zack O'Malley Greenburg has revealed to Media Ink that he has received an advance to write a book for Substack titled, "We Are All Musicians Now." Getty Images for SXSW Substack, an online ...
TechCrunch

WordPress.com challenges Substack with launch of paid newsletters

WordPress.com is taking on Substack and others with today’s news that its Newsletter product will now support paid subscriptions and premium content. First launched in December, WordPress.com ...