HMH Data Breach
Status: Confirmed
Breach Intelligence Summary
Entity: HMH · Actor: LAPSUS$ · Source: DataBreach.com / ObscureIQ intelligence
Attack: Data Exfiltration via Under investigation
Timeline: Breach (Oct, 2025) · Reported (Oct, 2025) · Leak (10/3/25)
Exposure: 5.3M+ records · Email, Phone Number, Home Address
Status: Confirmed · Risk: Moderate (Phishing / SIM swap)
Summary
The incident is one of several breaches affecting Salesforce in 2025. A group calling itself “Scattered LAPSUS$ Hunters” released a limited sample of the stolen database on October 3 2025. The records have since been indexed and anonymized in our search engine. According to the attackers the full dataset is scheduled for release on October 10 2025.
Data found in hackers’ sample – 🧍 Personal Information
Full name – ✅ Present Account type (“Prospect”) – ✅ Present Division / department – ✅ Present Customer class – ✅ Present (“Individual / Consumer”) Grade range – ✅ Present (“-”) School type – ✅ Present (“Other”) Gender – ⛔ Empty, Birthdate – ⛔ Empty
📧 , Contact Information
Email address – ✅ Present Phone number – ✅ Present Mailing / billing address – ✅ Present (street city state ZIP country) Shipping address – ✅ Present (street city state ZIP country) County – ✅ Present (“ST. CROIX”), Latitude / longitude – ✅ Present (geocoded address)
🏢 , Account / Organization Information
Account ID – ✅ Present Account name – ✅ Present Account type – ✅ Present (“Consumer”) Account group – ✅ Present (“Z001”) Account status – ✅ Present (“Active Lead”) Account division – ✅ Present (“SCH”) Account region – ✅ Present (“NAM”) District / parent district name – ✅ Present District ID and PID – ✅ Present District account roll-up name and source IDs – ✅ Present Strategic account flag – ✅ Present (false) Territory and region codes – ✅ Present (Eloqua 999999 SAOT region OT) SAP customer number – ✅ Present Legacy source ID – ✅ Present, Customer source / data source – ✅ Present (“SAP”)
💬 , Marketing & Communication
Telemarketing contact flags (elementary secondary district) – ✅ Present (“No”) Heinemann tier description – ✅ Present (“Other”) HMH Insights support field – ✅ Present (“HMH Insights”) Manage contact URL – ✅ Present (Salesforce portal link) Data quality description – ✅ Present (“Missing: Industry Rating”) Marketing or Eloqua territory field – ✅ Present (“999999”)
💳 , System & Operational Fields
Internal account ID (SAP and Salesforce IDs) – ✅ Present Credit and shipping terms – ✅ Present (“Credit By: Ship To” “FOB: Shipping Point”) Service group – ✅ Present (“P3”) Service priority – ✅ Present (“Standard”) Office / front or back office fields – ✅ Present (with embedded image markup) Import test / placeholder – ✅ Present Industry check – ✅ Present (“No”) Account region and country – ✅ Present (“NAM” “USA”) SkillsTutor / Heinemann fields – ✅ Present User reporting filter (numeric flag) – ✅ Present (1.0) Account count – ✅ Present (1.0)
Created date / by – ✅ Present Last modified date / by – ✅ Present SystemModstamp – ✅ Present RecordTypeId – ✅ Present OwnerId – ✅ Present Photo URL – ✅ Present Division (internal Salesforce code) – ✅ Present Account ID (Full 18-character) – ✅ Present Experian QAS update timestamp – ✅ Present Flags like “MDTPenabled” “K_12_AE_Validate” – ✅ Present
About HMH
HMH is the organization affected by this breach. User data may have been generated through account creation, service usage, or business operations.
If you have interacted with HMH in any capacity, your data may be included in this breach.
Threat Actor: LAPSUS$
This breach has been attributed to LAPSUS$. The group is known for data theft campaigns targeting organizations through various intrusion methods.
- Under investigation
Breach Exploitation Status
Moderate
Status
Detected
Possible
Possible
Unknown
Unknown
3–5 years
Phone numbers and addresses change over time but remain valid long enough for sustained exploitation campaigns.
Data Points Exposed
Dark Web Verification
Status: Confirmed
- Dataset containing approximately 5.3M+ records has been identified in breach intelligence sources.
- The data is indexed and searchable across breach notification platforms.
Impact
This breach carries moderate risk due to the nature of exposed data fields and the scale of affected records.
- Targeted phishing referencing HMH accounts or services
- SIM-swap attempts where phone numbers are present
- Physical mail scams and address-based identity verification fraud
- Data broker enrichment and resale
Recommendations for Impacted Individuals
If you believe your information may be included:
Non-clients may request a breach impact review.
HMH account updates
Password reset requests
Verify directly through official channels.
Email compromise is often the first pivot point.
Frequently Asked Questions
In Oct, 2025, HMH experienced a data breach that resulted in the exposure of approximately 5.3M+ records containing personal information.
The exposed data includes Email, Phone Number, Home Address.
Approximately 5.3M+ records were affected based on current breach intelligence.
Yes. This breach is treated as confirmed based on data observed in breach intelligence platforms.
Data circulation has been detected across breach-sharing channels. Downstream exploitation risk exists based on the nature of the exposed fields.
Rotate passwords associated with HMH, enable multi-factor authentication on email and financial accounts, and monitor for suspicious activity.
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Corporate Accountability
Organizations that collect personal data have a duty to implement reasonable safeguards and to notify affected individuals when breaches occur.
Scope assessments may evolve as investigations continue. Users should not rely solely on early estimates when making risk decisions.
ObscureIQ Advisory
We combine proprietary dark web access with commercial and restricted breach intelligence to verify exposure and assess real-world risk.
- A public-facing individual
- A high-profile executive
- A customer of HMH
- Or simply concerned about credential reuse
We can confirm whether your information is circulating and evaluate downstream threat vectors.