HMH
Data Breach on October 06, 2025
| Data Breach Report | |||
|---|---|---|---|
| Victim | hmhco.com | ||
| Threat Actor | ScatteredLAPSUSHunters | ||
| Date Discovered | Oct 06, 2025 | ||
| Description | HMH is an educational publisher and edtech company based in the USA (Massachusetts), offering K-12 curriculum, instructional content, assessment tools, professional learning, and digital learning solutions. | ||
| Leak Size | 88GB |
Credential Exposure for hmhco.com
We've indexed 954 @hmhco.com accounts from external breaches, plus 11,733 credentials for hmhco.com itself.
Last checked Aug 16, 2026
| @hmhco.com addresses from external breaches | |
|---|---|
| Third-party breaches | 871 accounts · across 161 breaches · 806 with a plaintext password · most recent Jan 25, 2026 |
| Combo lists | 167 accounts · most recent Aug 7, 2026 |
| Passwords for hmhco.com accounts | |
|---|---|
| Combo lists | 10,024 logins · most recent Aug 15, 2026 |
| Infostealer logs | 3,854 logins · 2,351 infected devices · most recent Aug 8, 2026 |
Logins may belong to customers or to staff, and the data doesn't say which. None of this is necessarily connected to the ransomware attack above.
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