Substack notifies users about a "limited" data breach in October 2025 via a now-patched flaw found on February 3; a threat actor leaked a ~697K-record database (Sergiu Gatlan/BleepingComputer)

Techmeme

Sergiu Gatlan / BleepingComputer:
Substack notifies users about a “limited” data breach in October 2025 via a now-patched flaw found on February 3; a threat actor leaked a ~697K-record database — Newsletter platform Substack is notifying users of a data breach after attackers stole their email addresses and phone numbers in October 2025.

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