Every public data breach

Disclosed this week47On record26,367

47 disclosed this week · 26,367 on record

Houghton Mifflin Harcourt Publishing

1 breachMedia

Breach, details not statedExposed names, Social Security numbers and names. Reported to the Maine AG.MediaUSDec 15, 2017
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Every breach here links to its sources and official notices. Across Glyph: lawsuits, incidents and outages.

Added2026-09-25
Houghton Mifflin Harcourt Publishing, 2017-12-15
Added2026-09-25
Houghton Mifflin Harcourt Publishing