Houghton Mifflin Harcourt Company
bd_3da1ab23695c5289 · schema v1 · pii pii-v1
Full breach record for Houghton Mifflin Harcourt Company →Threat-actor claim — not a regulatory filing
This row is a claim by the ransomware group Shinyhunters on its public extortion blog. It has not been validated by the victim or any regulator. Treat attribution and counts as the threat actor's assertion until a regulatory filing or victim disclosure corroborates them.
Source: Ransomware.live
Post text · scraped from the leak site
Your data was compromised in several of our campaigns throughout the past few months. We urge you to engage with us, it is in your best interests. This is a final warning to reach out by 12 May 2026 before we leak along with several annoying (digital) problems that'll come your way. Make the right decision, don't be the next headline. | Updated: 9 May 2026 | Warning: FINAL WARNING PAY OR LEAK
Source provenance
- Source URL
- https://www.ransomware.live/id/SG91Z2h0b24gTWlmZmxpbiBIYXJjb3VydCBDb21wYW55QHNoaW55aHVudGVycw==
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
- Filed at
- May 9, 2026
- Raw hash
- 2ccbebf879d91a0e9d8d094fcbf77323d97402130d89076833d340c75eae89f2
Reporting entity
- Name
- shinyhunters
Victim entity
- Name
- Houghton Mifflin Harcourt Companynorm: houghton mifflin harcourt
- Domain
- hmhco.com
- Industry
- Educationllm
What this source establishes
- Source ceiling
- A leak-site claim can't tell us: discovery date · materiality · notification · affected count · confirmed data types · compliance clock. These stay blank until a regulatory filing or victim disclosure lands.
- Attack vector
- Ransomware· shinyhunters
- Threat actor
- ShinyhuntersExternalFinancial
Compliance
- Compliance flags
- — (clock not assessable for this source)
Extraction provenance
- Status
- No extraction artifact recorded for this disclosure.