Houghton Mifflin Harcourt Publishing
1 breachMedia
| Breach | Affected | ||||
|---|---|---|---|---|---|
| Disclosed Dec 15, 2017Dec 15, 20178 years ago | Dec 15, 20178 years ago | Not stated | Media | Confirmed | Unknown |
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- 2026-09-25 · Houghton Mifflin Harcourt Publishing, 2017-12-15 · added
- 2026-09-25 · Houghton Mifflin Harcourt Publishing · added