Substack, an American online platform that provides publishing, payment, analytics, and design infrastructure for subscription-based content, has allegedly been compromised. The incident, which reportedly surfaced in late 2025, involved the extraction of data via a scraping method. Although the platform’s total user base is significantly larger, the scope of this specific leak is limited to approximately 697,313 records. Reports indicate that the method used to obtain the data was quickly identified and patched by the company.
The allegedly compromised data includes:
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Full names
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Email addresses
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Phone numbers
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User IDs
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Stripe IDs
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Profile pictures
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Account biographies
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Account creation dates
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Social media handles
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