Disclaimer

We Leak Info did not take any part in this data breach. Furthermore all information that we have on this data breach has been published in this article.

We Leak Info does not sell or trade data. Please do not contact us about acquiring this data, we will ignore such requests.

Journalists, researchers, media outlets, law enforcements, and alike can contact us through the methods listed below.

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Introduction

Chegg is a popular online educational tool used by millions of students. On September 19th, 2018 Chegg publicly acknowledged a data breach.

According to the donor, Chegg was breached on April 2018 and impacted 35,573,936 users.


What is We Leak Info?

We Leak Info is the industry leading data breach search engine. With over 10 billion records and 7,000 data breaches. Unlike similar sites such as Have I Been Pwned, We Leak Info allows the user to view what information was exactly leaked.

See if your information has been leaked for free at weleakinfo.com.


Leaked Information

The following information was leaked:

  • Username
  • Email
  • Hash
  • First Name
  • Last Name
  • Address

Hashes

The hashes were encrypted using MD5. As this is a very weak hashing algorithm, we expect at least 90% of all hashes to be cracked successfully.

Most of these hashes can be cracked through our hash API.


Email Domains

We found a total of 511,189 unique email domains. We have posted the top 20 below.

Top 20 Email Domains:

  • Gmail.com: 13,876,695
  • Yahoo.com: 7,898,212
  • Hotmail.com: 3,567,258
  • Aol.com: 1,343,149
  • Live.com: 403,524
  • Comcast.net: 377,528
  • Ymail.com: 263,119
  • Icloud.com: 252,241
  • Outlook.com: 227,830
  • Msn.com: 225,107
  • Sbcglobal.net: 220,391
  • Aim.com: 182,381
  • Pd.com: 172,919
  • Qq.com: 157,087
  • Proxymail.facebook.com: 151,975
  • Vst.com: 144,034
  • Att.net: 126,056
  • Verizon.net: 125,396
  • Zinch.com: 106,113
  • Me.com: 106,034

What can I do?

If you've been affected by this data breach we recommend changing your password and enabling two factor authentication for critical accounts.

Not sure you've been affected? See if your information has been leaked for free at weleakinfo.com.


Conclusion

We hope by publishing this disclosure and making it publicly available to everyone, it will help users understand what exactly happened.


Updated August 10th 2019: Fixed incorrect year for when Chegg acknowledged the data breach.