McGraw Hill
MEDIUM RISKData breach — April 2026
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.
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What happened in the McGraw Hill data 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.
The exposed data included 4 types of personal information. Learn more about what a data breach means for you.
Quick answer — was McGraw Hill hacked?
Yes. McGraw Hill was breached in April 2026. The breach exposed 13,500,136 records including email addresses, names, phone numbers. This breach has been independently verified. If your email was involved, your data may still be at risk today. Check if you were affected.
Why was the McGraw Hill breach so dangerous?
The McGraw Hill breach exposed 13,500,136 records — that is 13.5M people whose personal data is now circulating on the dark web. The combination of email addresses, names, phone numbers makes this a medium-risk breach that should be addressed promptly.
Don't wait to find out — check if your email was exposed in this breach now.
What data was stolen in the McGraw Hill breach?
Email addresses — used for phishing attacks and credential stuffing against your other accounts
Names — used to build profiles and target you with personalised scams
Phone numbers — enables SIM swapping attacks and targeted SMS phishing scams
Physical addresses — combined with other data, used for identity theft and physical fraud
Is the McGraw Hill breach still dangerous in 2026?
Yes. Stolen data from the McGraw Hill breach remains dangerous years after the incident. Research shows that over 65% of stolen credentials from older breaches have never been changed by the account holders. Attackers routinely compile data from multiple breaches to build complete profiles, and credentials from 2026 are still actively used in credential stuffing attacks today.
Personal information like email addresses, phone numbers, and dates of birth never expire. Even if you changed your McGraw Hill password, the other exposed data can be combined with information from other breaches to target you. Learn more about how long stolen data stays dangerous.
Frequently asked about the McGraw Hill breach
Approximately 13,500,136 user records were exposed in the McGraw Hill breach in April 2026.
Yes. Leaked credentials are actively used in credential stuffing attacks years after a breach. If you reused your McGraw Hill password elsewhere and haven't changed it, those accounts remain at risk today.
Enter your email in the free checker on EmailLeaked. We scan 12 billion+ breach records including the full McGraw Hill dataset and tell you instantly whether your email was exposed and what data was taken.
Change your McGraw Hill password immediately, change any other account where you used the same password, enable two-factor authentication on all important accounts, and monitor for phishing emails over the next 90 days.
How this breach page is reviewed
Breach pages are generated from structured breach records and reviewed for practical risk guidance. Risk labels are based on exposed data types and are meant to help readers prioritize action.
Who was affected by the McGraw Hill breach?
The McGraw Hill data breach affected approximately 13,500,136 users who had accounts with the service. With 13.5M records exposed, this is one of the larger breaches tracked in our database of 979+ known breaches.
If you ever created an account with McGraw Hill or used their services, your data may have been included in this breach. Check your email now to find out. You can also read our guide on what to do immediately after a data breach.
If your email was in the McGraw Hill breach
Change your McGraw Hill password immediately
Go to McGraw Hill and change your password right now. Use a strong, unique password that you have never used anywhere else.
Change any account sharing that password
If you used the same password on other sites, change it on every one of them. Attackers test stolen credentials on hundreds of popular sites within hours.
Enable two-factor authentication
Turn on 2FA on McGraw Hill and every important account. Even if your password is known, attackers cannot get in without the second factor.
Check your other accounts for this breach
Run a full email check to see every breach your email appears in — not just this one.
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