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Sead Fadilpašić

Substack data breach confirmed: user phone numbers email addresses all stolen in attack, here's what we know

Substack Chris Best TechRadar

Substack design.

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
BreachForums thread advertises ~700K stolen records, despite Substack claiming no evidence of abuse so far

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