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.

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.

Source: TechMeme
Source Link: http://www.techmeme.com/260205/p19#a260205p19