Trello

Disclosed Jan 22, 202415,111,945 accountsUnverified

Public API abuse lets scraper compile 15 million Trello user emails

Data on more than 15 million Trello users, including emails, names and usernames, was posted for sale after being compiled by enumerating a publicly accessible Trello resource with email addresses from earlier breaches. Trello said no unauthorized access to its systems had occurred.

What is known

People affected	15,111,945 (accounts in the leaked data, per Have I Been Pwned)
Disclosed	Jan 22, 2024
Happened	Jan 16, 2024
Attack	Scraping
Data exposed	EmailsNames
Sector	Tech · US
Status	Unverified: not yet confirmed by an official notice, a filing or the organization
Check your email	Have I Been Pwned

Sources

Aggregatorhaveibeenpwned.com

Have I Been Pwned: Trello

Notices filed

Accounts in the dataJan 22, 2024

Have I Been Pwned15,111,945 people

TotalJan 22, 2024

ResearchCount not stated

History of this record

source_type2026-09-25

aggregator to pressby seedSource

country2026-09-25

empty to USby seedSource

attack2026-09-25

misconfiguration to scrapingby seedSource

summary2026-09-25

In January 2024, data was scraped from Trello and posted for sale on a popular hacking forum . Containing over 15M email addresses, names and usernames, the data was obtained by enumerating a publicly accessible resource using email address to Data on more than 15 million Trello users, including emails, names and usernames, was posted for sale after being compiled by enumerating a publicly accessible Trello resource with email addresses from earlier breaches. Trello said no unautby seedSource

title2026-09-25

empty to Public API abuse lets scraper compile 15 million Trello user emailsby seedSource

Added2026-09-25

First recordedby backfillSource

First seen 2026-09-25 (Have I Been Pwned). Record counts are as reported. Not legal advice.

Everything about Trello