The 43rd president of the United States launched his blog on the site Feb. 16 with a 1,500-word tribute to another George: President George Washington. “Few qualities have inspired me more than ...

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 has confirmed it suffered a security incident, leading to the compromise of users’ email addresses and phone numbers. Chris Best, the CEO of Substack, notified users of ...

Substack confirmed on February 4 that an unauthorized third party accessed user emails and phone numbers during a security breach that occurred in October 2025. The newsletter platform discovered the ...

Newsletter platform Substack has confirmed a data breach in an email to users. The company said that in October, an “unauthorized third party” accessed user data, including email addresses, phone ...

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 ...

The hacker claims to have stolen nearly 700,000 Substack user records, including email addresses and phone numbers. Digital publishing platform Substack has disclosed a data breach after a hacker ...

Data accessed in October 2025 went undetected until February, affecting subscribers across the newsletter platform with no evidence of misuse yet identified. Substack disclosed a security breach that ...

Popular newsletter platform Substack is the latest company to confirm it experienced a security incident, in which users' email addresses and phone numbers were exposed. According to an email sent to ...

The company has emailed affected users after a dark web source claims the data of almost 700,000 users was compromised. Substack, a high-profile publishing platform widely used by academics, ...

NEW YORK, Jan 16 (Reuters Breakingviews) - The eternal quest for a sustainable business model in media has flooded in-boxes. Fast-growing Substack stands at the ready with publishing and marketing ...