McGraw Hill — data breach (McGrawHill)

Domain: mheducation.com · Accounts affected: 13,500,136 · Data exposed: Email addresses, Names, Phone numbers, Physical addresses · Verified breach — 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.