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

Blogging platform Substack warns users that their phone numbers and email addresses were compromised as a hacker claims a ...

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

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

The digital publishing platform Substack has told some of its users that their data was stolen in a security breach. The affected account holders had their email addresses and phone numbers scraped in ...

Substack Discloses User Contact Data Breach. <img decoding=async alt= border=0 width=320 data-original-height=667 ...

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 ...

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

I have a busy week with podcasts, webinars, and a keynote! Communicating and sharing is vital to the cybersecurity industry. It is how we leverage shared knowledge and experiences to make more ...