Results for “"substack accounts"”
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Have I Been Pwned
9 months ago
Substack - 663,121 breached accounts
In October 2025, that was subsequently circulated more widely in February 2026. The breach exposed 663k account holder records containing email addresses along with publicly visible profile information from Substack accounts, such as publication names and bios. A subset of records also included phone numbers. the publishing platform Substack suffered a data breach