[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fehlbqs6nhf8g":3},{"success":4,"breach":5},true,{"_id":6,"name":7,"title":8,"slug":9,"domain":10,"breachDate":11,"addedDate":12,"modifiedDate":12,"contentUpdatedAt":13,"source":14,"sourceUrl":15,"sourceUrls":16,"pwnCount":17,"affectedCount":17,"affectedCountStatus":18,"affectedCountLowerBound":19,"affectedCountUnit":20,"hasEnglishDescription":4,"severity":21,"dataClasses":22,"description":25,"seoTitle":26,"seoTitleEn":27,"seoDescription":26,"seoDescriptionEn":28,"logoUrl":29,"isVerified":4,"isSensitive":30,"isSpamList":30,"isMalware":30,"company":31},"68e3266eda11adda48825427","Youku","Youku Data Breach","youku","youku.com","2016-12-01T00:00:00.000Z","2017-04-15T11:02:35.000Z","2026-07-19T00:01:35.460Z","Verified breach record","https:\u002F\u002Fwww.upguard.com\u002Fblog\u002Fbiggest-data-breaches",[15],91890110,"known",null,"unknown","Critical",[23,24],"Email addresses","Passwords","\u003Cp>The Youku data breach is a large-scale account data incident from December 2016 associated with the China-based online video service. The verified scope is 91,890,110 unique accounts. The dataset contains email addresses and passwords; the password field should be considered not as plain text, but as MD5 password hashes.\u003C\u002Fp>\u003Cp>Email and password data exposed in video and entertainment services like Youku can affect not only the relevant account but also other services where the same password is reused. Since MD5 is an old and weak hashing format, short, predictable, or previously leaked passwords can be cracked more easily. Therefore, the risk is not limited to video account access alone.\u003C\u002Fp>\u003Ch2>Leaking Data Types and Risks\u003C\u002Fh2>\u003Cp>The verified data classes in the Youku dataset are email addresses and passwords. Email addresses can be used for targeted phishing, account matching, spam, and fake security notifications. The password field is in the form of MD5 password hashes; this does not mean that the plaintext password is directly visible, but it increases the risk of cracking weak passwords.\u003C\u002Fp>\u003Cp>Attackers may try the same email and password combination on social media, email accounts, shopping, gaming, video, cloud storage, and work accounts. If the same password is reused across different services, an old video platform breach can turn into a current account takeover risk. The email address can also be used in messages themed around fake subscriptions, copyright warnings, video account security, or payment notifications.\u003C\u002Fp>\u003Ch2>Verified Scope and Boundaries\u003C\u002Fh2>\u003Cp>The breach date for Youku should be considered December 1, 2016, the record addition date April 15, 2017, and the number of affected accounts 91,890,110. The verified data fields are email addresses and passwords. The password field is associated with the MD5 hash format, and this distinction is important to accurately convey user risk.\u003C\u002Fp>\u003Cp>While explaining the scope, phone numbers, physical addresses, payment cards, identity documents, private messages, tracking history, or video upload history should not be presented as definite leak areas. Reliable scope involves account identity and password hash risks. Therefore, the warning to be given to the user should be built around password reuse, email-based phishing, and account security checks.\u003C\u002Fp>\u003Ch2>User Groups at Risk\u003C\u002Fh2>\u003Cp>The main group at risk consists of people who had a Youku account in 2016 or earlier, or who used the same email address for video, social media, and entertainment services. Users who reuse the same password for their email account, social media, shopping sites, gaming accounts, cloud storage, or work account carry a higher risk.\u003C\u002Fp>\u003Cp>Users with old accounts related to China-based video and entertainment services should be cautious of messages themed around fake account security, copyright notification, subscription renewal, video removal, or payment alert. Attackers can prepare messages that appear as if there is a real service relationship, even if they only know the email address. In the case of password reuse, the risk is transferred to other accounts.\u003C\u002Fp>\u003Ch2>Urgent Measures to Be Taken\u003C\u002Fh2>\u003Cp>Users with a Youku match should change their passwords on their Youku account and on all accounts using the same password. Priority should be given to email accounts, social media, shopping, gaming, video, cloud storage, and work accounts. New passwords should be long, unique, and chosen from values stored in a password manager.\u003C\u002Fp>\u003Cp>Two-factor authentication should be enabled on all major accounts that support it, active sessions and connected devices should be checked, and unrecognized sessions should be closed. For video account security, subscription, copyright, payment, or old account warning themed messages, you should log in through the service's known web address or official app before clicking on any links. One-time codes, account passwords, or recovery links should not be shared in any support conversations.\u003C\u002Fp>\u003Ch2>Long-Term Security Strategies\u003C\u002Fh2>\u003Cp>In the long term, a unique password for each service, a password manager, and two-factor authentication are the basic defenses. Entertainment and video services are often not considered critical accounts; however, when the same email and password pattern is used, data from these accounts can be used in attempts to access more important services.\u003C\u002Fp>\u003Cp>Users should regularly review old video, gaming, and entertainment accounts, close accounts that are unnecessary, and keep recovery emails up to date. In breaches associated with old password hash formats like MD5, fully resetting the password is the most important step. Since targeted messages can continue for a long time when an email address is exposed, suspicious links should be verified through a separate channel.\u003C\u002Fp>\u003Ch2>Record Control and User Action\u003C\u002Fh2>\u003Cp>LeakData check shows whether the queried email address is found in the Youku dataset. A positive result indicates that the email address is included in this dataset and that the verified data fields should be considered for risk assessment. This result does not prove that payment card, phone number, browsing history, or private message content has been exposed.\u003C\u002Fp>\u003Cp>A negative result only means that no match was seen in the Youku dataset; it does not eliminate the possibility of appearing in other data breaches. Users who receive a positive result should clear password reuse, enable two-factor authentication, review old sessions, and verify security messages themed around video or entertainment accounts through a separate channel.\u003C\u002Fp>","","Youku Data Breach (91.9 Million Reported Records)","Youku Data Breach. 91.9 Million reported records were reported. Reported data: Email addresses, Passwords. Review the scope, risks, and protective steps.","\u002Fuploads\u002Flogo\u002Fyouku_com.webp",false,{"name":7,"sector":32,"country":33,"website":10,"websiteArchiveUrl":26,"websiteStatus":26,"websiteCheckedAt":19},"Online video streaming","China"]