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On the breached site and everywhere else you reused it. Make every password unique.
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McGraw Hill breach: questions and answers
When did the McGraw Hill data breach happen?
The McGraw Hill breach dates to April 2026.
How many records were leaked in the McGraw Hill breach?
LeakCheck has indexed 8,816,720 records from the McGraw Hill breach.
What data was exposed in the McGraw Hill breach?
The leaked records include email addresses, names, phone numbers, physical addresses and geographic locations.
Were passwords exposed in the McGraw Hill breach?
No. The records indexed from McGraw Hill do not include passwords — but the other details they hold can still be used for phishing.
How do I check if my data was in the McGraw Hill breach?
Enter your email address, username or phone number in the search form on this page. The free check shows whether your data appears in the McGraw Hill breach — and in any of the other 1,469 sources LeakCheck indexes.
What should I do if my data was in the McGraw Hill breach?
Change the password you used on McGraw Hill and everywhere you reused it, turn on two-factor authentication, and watch for phishing that quotes details from the leak. To hear about the next breach first, set up breach monitoring.