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BreachesMay 9, 2026

‼️🇺🇸 Houghton Mifflin Harcourt Company has been added to the ShinyHunters Pay or Leak portal ht...

Houghton Mifflin Harcourt added to ShinyHunters extortion portal.

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Summary

Educational publisher Houghton Mifflin Harcourt has been listed on the ShinyHunters Pay or Leak extortion portal, indicating a data breach and extortion threat. ShinyHunters is a known threat actor group operating a public-facing leakage site where stolen data is posted unless ransom demands are met. This suggests the company's data has been compromised and is being used as leverage for payment.

Entities

Houghton Mifflin Harcourt Company (vendor)ShinyHunters (threat_actor)