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Response snapshot Oct 27, 2026, 03:23 UTC

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Disclosed incidenthibp-mcgrawhill

McGraw Hill breach: 13,500,136 accounts exposed

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".

At a glance

Sources
1 source

What to do

If you or your organization used this service, change reused passwords, watch for phishing that uses the exposed data, and check the disclosure for the organization's guidance.

Read Have I Been Pwned: McGraw Hill (opens a new tab)

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.

Related technology

Sources

  1. Primary source

    Have I Been Pwned: McGraw Hill (opens a new tab)

    Verified breach loaded into Have I Been Pwned: account count, exposed data types, and dates.

    Published Checked

  2. Primary source

    Have I Been Pwned breach API (opens a new tab)

    The breach list that supplied this entry.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, April 16). McGraw Hill breach: 13,500,136 accounts exposed. https://kevwire.com/record/hibp-mcgrawhill

MLA

"McGraw Hill breach: 13,500,136 accounts exposed." KEVWire, 16 Apr. 2026, kevwire.com/record/hibp-mcgrawhill.

Chicago

KEVWire. "McGraw Hill breach: 13,500,136 accounts exposed." Last modified April 16, 2026. https://kevwire.com/record/hibp-mcgrawhill.

Evidence summary (plain text)

McGraw Hill breach: 13,500,136 accounts exposed (Apr 16, 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.
Sources:
Have I Been Pwned: McGraw Hill: https://haveibeenpwned.com/Breach/McGrawHill
Have I Been Pwned breach API: https://haveibeenpwned.com/api/v3/breaches
Record ID: hibp-mcgrawhill.
Record origin: Ingested record.
AI evidence: Not assessed.
About this data

This record was ingested from a data source. Retrieved: Oct 27, 2026, 02:25 UTC. Ingestion is not an independent editorial investigation.

Verified by Have I Been Pwned. Breach date: 2026-04-10; loaded 2026-04-16. Exposed data: Email addresses, Names, Phone numbers, Physical addresses. Counts are accounts in the loaded data, not necessarily distinct people.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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