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CRITICAL2026-04-10via haveibeenpwned

🚨 McGraw Hill Breach — 13.5M Accounts Exposed

McGraw Hill suffered a data breach affecting 13.5M accounts. Here's what happened, what data was exposed, and what you should do right now.

13,500,136
ACCOUNTS
CRITICAL
SEVERITY
4
DATA TYPES

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.

Impact

  • Affected accounts: 13.5M
  • Data exposed: Email addresses, Names, Phone numbers, Physical addresses
  • Severity: CRITICAL
  • Source: [haveibeenpwned](https://haveibeenpwned.com/PwnedWebsites#McGrawHill)

    • What You Should Do

    If you have an account with McGraw Hill, take these steps immediately:

  • **Change your password** — Use a unique, strong password (16+ chars with mixed case, numbers, symbols)
  • **Enable 2FA** — Turn on two-factor authentication if available
  • **Check your email** — Search for breach notifications from McGraw Hill
  • **Monitor your accounts** — Watch for unauthorized access on any service where you reused the same password
  • **Scan your site** — If you run a website, [run a free ScanMyVibe scan](https://scanmyvibe.co/scan) to check if your own security headers and configurations protect against common attack vectors

    • Is Your Website Secure?

    Data breaches often exploit weak security configurations — missing Content-Security-Policy headers, misconfigured CORS, exposed API keys. These are exactly the issues ScanMyVibe detects in under 30 seconds.

    [Scan your site free →](https://scanmyvibe.co/scan)

    Timeline

  • 2026-04-10 — Breach reported
  • 2026-04-10 — ScanMyVibe breach alert published
  • Ongoing — Investigation in progress

    • This article is auto-generated by ScanMyVibe's breach monitoring system. Sources are verified but details may evolve as investigations progress. Last updated: 2026-04-16.

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