Substack data breach exposed users’ emails and phone numbers

Substack is notifying immoderate users that the email addresses and telephone numbers linked to their accounts were exposed successful a "security incident" past year. In an email to relationship holders, Substack CEO Chris Best said that a hacker had accessed interior information without authorization successful October 2025, but that passwords, recognition paper numbers, and different fiscal accusation stay secure.

"On February 3rd, we identified grounds of a occupation with our systems that allowed an unauthorized 3rd enactment to entree constricted idiosyncratic information without permission, including email addresses, telephone numbers, and different interior metadata," Best said successful the email. "We bash not ha …

Read the afloat communicative astatine The Verge.