[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f9fwj9480muxh":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":19,"affectedCount":19,"affectedCountStatus":20,"affectedCountLowerBound":21,"affectedCountUnit":22,"hasEnglishDescription":4,"severity":23,"dataClasses":24,"description":27,"seoTitle":28,"seoTitleEn":29,"seoDescription":28,"seoDescriptionEn":30,"logoUrl":31,"isVerified":4,"isSensitive":32,"isSpamList":32,"isMalware":32,"company":33},"68e3266eda11adda488253dd","Tumblr","Tumblr Data Breach","tumblr","tumblr.com","2013-02-28T00:00:00.000Z","2016-05-29T22:59:04.000Z","2026-07-19T00:00:04.046Z","Verified breach record","https:\u002F\u002Fstaff.tumblr.com\u002Fpost\u002F144263069415\u002Fwe-recently-learned-that-a-third-party-had",[15,17,18],"https:\u002F\u002Fwww.troyhunt.com\u002Fthe-emergence-of-historical-mega-breaches\u002F","https:\u002F\u002Fwww.vice.com\u002Fen\u002Farticle\u002Fhackers-stole-68-million-passwords-from-tumblr-new-analysis-reveals\u002F",65469298,"known",null,"unknown","Critical",[25,26],"Email addresses","Passwords","\u003Cp>The Tumblr data breach is a large-scale social platform security incident that occurred in February 2013 and affected 65,469,298 accounts. In the incident, users' email addresses and password hashes stored in salted SHA1 format were exposed. The announcement of the leak became public in 2016, bringing up the need for affected users to change their passwords and implement account security checks. This content clarifies which data of people with Tumblr accounts may be at risk, which areas have been verified, and which defense steps should be prioritized.\u003C\u002Fp>\u003Cp>Since this incident directly involved the password field, it should not be seen solely as an email privacy issue. Although using a salted SHA1 hash is a stronger storage method compared to plain text passwords, old, short, reused, or dictionary-based passwords can be cracked over time. Therefore, the risk is not limited to the Tumblr account; if the same email and the same or similar password were reused on other services, account takeover attempts could spread to different platforms as well.\u003C\u002Fp>\u003Ch2>Leaking Data Types and Risks\u003C\u002Fh2>\u003Cp>Verified data classes are email addresses and passwords. An email address can link the user's account, communication channel, and session identity on other services. The exposure of password hashes creates a higher risk, especially for users who reuse passwords. Attackers can try passwords that can be cracked with the same email on different services, compare them with previously compromised password lists, and target the account's recovery channels.\u003C\u002Fp>\u003Cp>In this incident, phone number, physical address, payment card, official ID, date of birth, or private message content are not listed as fields of verified data. Nevertheless, having both email and password together provides the two most critical inputs of the account takeover chain. If the user has reused the same password on social media, email, gaming, shopping, forum, or work accounts, the impact of the leak extends beyond Tumblr and becomes a much broader security issue.\u003C\u002Fp>\u003Ch2>Verified Scope and Boundaries\u003C\u002Fh2>\u003Cp>The scope is limited to the February 2013 Tumblr incident and 65,469,298 affected accounts. The record is associated with the Tumblr domain name tumblr.com and is classified as a verified breach. The addition and last modification time is verified as May 29, 2016. Data classes are limited to email addresses and passwords; unverified personal or financial fields are not shown to the user.\u003C\u002Fp>\u003Cp>Even if the password field is in hash form, it cannot be concluded that the risk is low. The hash value alone is not a plaintext password; however, due to weak password choices, reuse of the same password, and the increasing cracking capacity over the years, the practical risk remains. Therefore, the disclosure is based on the actual breach date, the correct number of affected accounts, and verified data fields, rather than showing the event date as 2025.\u003C\u002Fp>\u003Ch2>User Groups at Risk\u003C\u002Fh2>\u003Cp>The first group at risk consists of people who had a Tumblr account before 2013 or during that time and used the same email address across different services. Users who repeat the same or similar password on other accounts are at higher risk. People who no longer use their old accounts can also be affected; because if the email address is still active, it can be used for password attempts, account recovery attempts, and phishing messages.\u003C\u002Fp>\u003Cp>The secondary risk group consists of users who explicitly link their Tumblr account to their personal identity, art profile, community membership, or other social accounts. When email and password data are combined with other datasets, impersonation accounts, fake support messages, account lock notifications, or password reset traps can become more convincing. Users who have not changed their old passwords for years should especially consider that accounts that seemed secure in the past may still carry risks today.\u003C\u002Fp>\u003Ch2>Urgent Measures to Be Taken\u003C\u002Fh2>\u003Cp>Affected users should change their Tumblr password and any passwords similar to it. The changed password should be unique, long, and generated with a password manager. Social media, email, shopping, forum, gaming, and cloud accounts used with the same email address should also be checked. Multi-factor authentication should be enabled wherever possible, and login history and connected applications should be reviewed.\u003C\u002Fp>\u003Cp>The email account has a separate priority because account recovery links work via email on most services. The user should strengthen the email account password, check forwarding rules and recovery options, and log out of unfamiliar sessions. Password reset, account suspension, copyright, community rule, or security notification messages received on behalf of Tumblr or another service should be verified from the official login screen without clicking the direct link.\u003C\u002Fp>\u003Ch2>Long-Term Security Strategies\u003C\u002Fh2>\u003Cp>The basis of long-term defense is to completely stop reusing passwords. It is necessary to use a unique password for each service, generate strong values with a password manager, and make multi-factor authentication permanent. Old social accounts should be reviewed at regular intervals; unused accounts should be closed, recovery emails updated, and public profile areas should be minimized to not contain unnecessary personal information.\u003C\u002Fp>\u003Cp>The lesson for institutions and community managers is to regularly update password storage methods and take the risks of old hash algorithms seriously. On the user side, it should not be forgotten that a breach that occurred years ago can still be effective today. As long as old password habits are not cleaned up, past leaks can be used in new account takeover attempts.\u003C\u002Fp>\u003Ch2>Record Control and User Action\u003C\u002Fh2>\u003Cp>If a match is seen, the user should first check whether their Tumblr account is still accessible and whether the password has been changed afterwards. Then, they should look for password reuse on other services using the same email address, completely remove old passwords, and review security warnings. If the email address is still active, suspicious links, files, and account recovery messages received should be handled more carefully.\u003C\u002Fp>\u003Cp>The Tumblr data breach, despite being outdated, is a high-impact incident due to the leakage of email and password fields together. The correct action is not limited to just changing the Tumblr password; if the same password pattern was used on other accounts, all those accounts must be secured separately. When a user completes unique password, multi-factor authentication, and email account security steps, the persistent account takeover risk arising from this incident is significantly reduced.\u003C\u002Fp>","","Tumblr Data Breach (65.5 Million Reported Records)","Tumblr Data Breach. 65.5 Million reported records were reported. Reported data: Email addresses, Passwords. Review the scope, risks, and protective steps.","\u002Fuploads\u002Flogo\u002Ftumblr_com.webp",false,{"name":7,"sector":34,"country":35,"website":10,"websiteArchiveUrl":28,"websiteStatus":28,"websiteCheckedAt":21},"Social networking and microblogging platform","United States"]