Substack Ceo Informs Users Of A Data Breach

The integer publishing level Substack has told immoderate of its users that their information was stolen successful a information breach. The affected relationship holders had their email addresses and telephone numbers scraped successful a hack that occurred successful October 2025.

In an email posted connected Bluesky, Substack CEO, Christ Best, said nan institution became alert of nan breach connected February 3, which progressive an "unauthorized 3rd statement to entree constricted personification information without permission." While soul metadata was besides shared successful nan hack, Best said that in installments paper numbers and different financial specifications were not. No passwords were obtained either.

As good arsenic apologizing to Substack users, nan company’s CEO besides said successful nan email that nan information vulnerabilities person now been addressed. "We are conducting a afloat investigation, and are taking steps to amended our systems and processes to forestall this type of rumor from happening successful nan future," he said. Best added that location is nary grounds that immoderate of nan stolen information is being "misused," but advised nan affected relationship holders to beryllium wary of suspicious emails aliases matter messages they whitethorn receive.

The newsletter level has not disclosed really galore accounts were hacked, but Bleeping Computer reported that a database allegedly containing 697, 313 stolen information records from Substack was leaked connected nan hacking forum BreachForums.