Chegg 2018 Data Breach
Company · Education technology services · Subscription-based learning platform · USA / Global
Chegg Online Education Platform Breach (2018): 39 Million Student Records Including Passwords & Home Address Exposed
Online education platform.
Confirmed · ObscureIQ Intelligence
Breach Risk Index i
34/100
Lower riskHigher risk
Moderate: notable exposure with meaningful misuse potential.
Data Sensitivity i
StandardExposed data is largely lower-sensitivity. Standard identity-protection precautions are advised.
39.8MRecords
2018Year
The Breach Risk Index (BRI) is a proprietary 0–100 score rating how dangerous a breach is right now, based on how recently the data has been circulating on the dark web and how valuable it is to attackers.
Crucial data exposed
AddressPhysical address
Breach Summary
Chegg, a U.S. education technology company serving millions of college students, suffered a data breach in April 2018 that exposed records tied to approximately 39.8 million user accounts. The breach stemmed from a misconfiguration that left subscriber data inadequately secured. No external attacker group has been publicly attributed. The exposed data included names, email addresses, usernames, and passwords. Passwords were stored as unsalted MD5 hashes, a weak and outdated format that makes them relatively easy to crack. A subset of records also contained phone numbers and home addresses. For students, those addresses were likely campus or school-year residences. The combination of crackable passwords and contact details creates serious risk of account takeover, phishing, and targeted scams that exploit academic context such as fake tutoring offers or financial aid fraud. The Federal Trade Commission investigated the breach and reached a settlement with Chegg in 2022, one of the few formal enforcement actions against an education technology company. Under the settlement, Chegg was required to implement a data security program, reduce the personal data it retains, and offer users multi-factor authentication. Chegg notified affected users and prompted password resets following the incident. People whose data was exposed should treat any associated passwords as compromised, particularly if those credentials were reused on other accounts.
Full threat analysis, exploitation vectors, and principal guidance below.
10 additional sections · verified field analysis · defensive doctrine
Querying breach corpus…
Cross-referencing exposed field types…
Resolving threat-actor attribution…
Compiling principal risk advisory…
39.8M records analyzed
About Chegg
Chegg is a U.S. education technology company offering textbook rental and sale services, homework help, tutoring, and a suite of online learning tools primarily targeting college students. The company is publicly traded on the NYSE and headquartered in Santa Clara, California. At its peak Chegg was one of the most widely used academic support platforms among U.S. undergraduates. Its business has faced significant disruption from AI-powered homework assistance tools.
Why They Hold Your Data
Education technology platforms collect student identity, emails, subscription records, coursework activity, study behavior, payment-adjacent data, and in some cases school-linked information.
Recent Developments
Chegg has been in significant financial difficulty following the emergence of AI-powered homework tools including ChatGPT, which directly displaced its core tutoring and homework help business. The company reported substantial revenue declines starting in 2023 and undertook major restructuring including workforce reductions. In 2024 Chegg considered a potential sale of the company as its stock price collapsed from earlier highs. Mathway, which Chegg acquired in 2020, has been caught in the same structural decline.
Data Points Exposed
6 verified field types
Email Address
Full Name
Password High
Phone Number
Physical address High
Username
Breach Impact
In April 2018 Chegg suffered a breach affecting approximately 40 million subscriber records, exposing names, email addresses, usernames, passwords, phone numbers, and home addresses. The data was stored in an insecure manner — passwords were not adequately protected — which compounded the risk to affected users. Chegg notified users and required password resets. The FTC subsequently investigated and reached a settlement with Chegg in 2022, requiring the company to implement a security program, limit data collection, and provide users with multi-factor authentication options — one of the few EdTech breach-related FTC enforcement actions on record.
Exploitation & Downstream Threats
• Credential stuffing against reused passwords across other platforms | • SIM swap attacks where phone numbers are present | • Targeted phishing campaigns using exposed email addresses | • Doxxing risk from physical address exposure
Principal Risk Advisory
What this means for a principal
An education-sector breach: student, staff and identity records support identity theft and targeted phishing. For a high-profile principal this is targeting-grade, not merely identity-theft-grade: the combination lets an adversary locate, impersonate, or pressure the principal with little additional work.
What You Should Do
- Treat the home address as exposed: review mail and package handling and physical-security routines, and brief household staff to verify unusual requests.
- Reset any reused passwords and enable MFA on email first, then financial accounts.
- Guard against SIM-swap and vishing: add a carrier port-out PIN and verify any 'support' calls independently.
- Do not use unofficial 'am I affected' lookups; several are themselves harvesting operations.
How ObscureIQ Can Help
- Corpus confirmation: determine whether and where the principal (plus household and staff) appear in this dataset and which specific fields are exposed for them.
- Exposure mapping and footprint neutralization: cross-reference against broker-available data and suppress still-removable elements, prioritizing address and phone, since this record re-seeds broker networks.
- ThreatWatch tuned to this incident's identifiers and misuse pattern (impersonation and targeting patterns, not generic credential monitoring).
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