Newsletter platform Substack is notifying users of a data breach after attackers stole their email addresses and phone numbers in October 2025. Although the incident occurred four months ago, CEO ...
Popular newsletter platform Substack is the latest company to confirm it experienced a security incident, in which users' email addresses and phone numbers were exposed. According to an email sent to ...
Substack confirms October 2025 breach exposing user emails, phone numbers, and metadata CEO Chris Best assured no financial data or credentials were accessed; hole patched and investigation ongoing ...
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