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Breach occurred 2026-04-10Verifiedmheducation.com
What happened
In April 2026, education company McGraw Hill confirmed a data breach following an extortion attempt. Attributed to a Salesforce misconfiguration, the company stated the incident exposed "a limited set of data from a webpage hosted by Salesforce on its platform". More than 100GB of data was later publicly distributed, containing 13.5M unique email addresses across multiple files, with additional fields such as name, physical address and phone number appearing inconsistently across some records.
Data exposed
Frequently asked questions
The McGraw Hill data breach occurred on April 10, 2026. It was added to Have I Been Pwned's breach catalog on April 16, 2026.
13,500,136 accounts were affected by the McGraw Hill data breach, according to Have I Been Pwned's records.
The McGraw Hill breach exposed the following data types: Email addresses, Names, Phone numbers, Physical addresses.
Yes. Have I Been Pwned has verified the McGraw Hill breach, meaning there's confirmed evidence the exposed data is genuine and tied to real accounts.
Use KazaSec's free Email Breach Checker (/tools/breach-check) to check whether a specific email address has surfaced in the McGraw Hill breach, or any other known breach — the tool never stores what you search.
Our free Email Breach Checker tells you whether a specific email address has surfaced in this breach — or any other known breach — without ever storing what you search.
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