ZenBusiness data breach: what leaked and what to do
ZenBusiness (zenbusiness.com) had a data breach on 2026-03-27 affecting 5,118,184 accounts.
!Personal data leaked
Added to the catalogue 2 May 2026.
What leaked
- Email addresses
- Names
- Phone numbers
What happened
In March 2026, the hacker and extortion group "ShinyHunters" claimed to have obtained a substantial corpus of data from ZenBusiness, a business formation and compliance platform. The group claimed the data had been exfiltrated from platforms including Snowflake, Mixpanel and Salesforce, and threatened to publish it if a ransom was not paid. The following month, after claiming payment had not been made, ShinyHunters publicly released the data. The collection amounted to many terabytes across thousands of files that appeared to originate from multiple systems and business functions, including leads, support records and other CRM-related data. The data contained approximately 5M unique email addresses, often accompanied by name and phone number depending on the source file.
Description from Have I Been Pwned, in its words.
What to do
- Warn staff: emails, texts or calls quoting leaked details are not proof the sender is genuine.
- If card or bank details leaked, watch statements and tell the bank; if identity documents leaked, consider a credit ban or alert.
- Turn on two-factor sign-in on that service and on your email.
Common questions
What leaked in the ZenBusiness breach?
Email addresses, Names, Phone numbers
When did the ZenBusiness breach happen?
The breach date is 2026-03-27; it was added to the public catalogue on 2026-05-02.
What should I do if my staff used this service?
Warn staff about emails, texts and calls quoting the leaked details, and watch for sign-in attempts on the services they use.
Was a staff address in this breach?
Check one address free, no storage. Breach Watch checks every staff address after each new breach.