Substack Breach May Have Leaked Nearly 700,000 User Details Online Your email has been sent A popular home for independent writers is dealing with a security scare. Substack has confirmed that hackers ...
PCWorld reports that Substack experienced a data breach in October 2025, exposing email addresses and phone numbers of approximately 697,000 users. The company discovered the security flaw on February ...
Newsletter platform Substack is notifying users of a data breach after attackers stole their email addresses and phone numbers in October 2025. Although the incident occurred four months ago, CEO ...
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