This Substack Data Breach May Have Compromised Nearly 700,000 User Records

Substack won't share official numbers, but it seems like a pretty significant data breach.
SecurityWeek

Substack Discloses Security Incident After Hacker Leaks Data

The hacker claims to have stolen nearly 700,000 Substack user records, including email addresses and phone numbers.

Substack confirms data breach affects users’ email addresses and phone numbers

Substack said that customer data was accessed in October 2025, but wasn't discovered until early February.

Whitmer launching Substack amid 2028 speculation

Michigan Gov. Gretchen Whitmer (D) started a Substack on Monday as speculation swirls about a potential 2028 presidential bid ...

'Big Short' investor Michael Burry just launched a Substack and took aim at Nvidia in his first post

Michael Burry of "The Big Short" fame just debuted a Substack blog that promises a "front row seat" to his famous predictions ...
Her Campus on MSN

Substack is replacing social media in the digital detox era

Yes, I'm still looking at a screen, but it's more intentional. The post Substack Is Replacing Social Media In The Digital Detox Era first appeared on Her Campus.