Substack data breach exposed user email addresses and phone numbers for months before CEO Chris Best confirmed the October ...
Publishing platform Substack has disclosed a data breach that leaked nearly 700,000 user records after an unauthorized third-party exploited a security flaw.
Substack said that customer data was accessed in October 2025, but wasn't discovered until early February.
Substack has confirmed a major data breach that exposed emails and phone numbers for approximately 700,000 users, with the ...
The company has emailed affected users after a dark web source claims the data of almost 700,000 users was compromised.
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