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

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