Substack data breach exposed user email addresses and phone numbers for months before CEO Chris Best confirmed the October ...

The 43rd president of the United States launched a Substack site Feb. 16 with a 1,500-word tribute to a predecessor.

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

Former President George W. Bush wrote his first piece for Substack, praising George Washington’s leadership as the United States approaches its 250th anniversary. He emphasized Washington’s humility ...

George W. Bush became the latest writer to join Substack on Monday, with the 43rd POTUS launching his blog with a lengthy ...

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.

Forbes contributors publish independent expert analyses and insights. Karin Eldor covers entrepreneurs and leaders in fashion & lifestyle. The momentum hasn’t slowed. Every time I went to hit publish ...

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.

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