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.
Substack states that the security flaw has now been fixed and that a full investigation is underway. There are currently no ...
Publishing platform Substack has disclosed a data breach that leaked nearly 700,000 user records after an unauthorized third-party exploited a security flaw.
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 ...
Substack has confirmed a major data breach that exposed emails and phone numbers for approximately 700,000 users, with the ...
Substack confirms a major data breach exposing user emails and phone numbers. What’s behind the breach, and what’s next?
Some results have been hidden because they may be inaccessible to you
Show inaccessible results