[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f30ertum1ydsmq":3},{"success":4,"breach":5},true,{"_id":6,"name":7,"title":8,"slug":7,"domain":9,"breachDate":10,"addedDate":11,"publishedAt":12,"modifiedDate":13,"contentUpdatedAt":14,"source":15,"sourceUrl":16,"sourceUrls":17,"pwnCount":18,"affectedCount":18,"affectedCountStatus":19,"affectedCountLowerBound":12,"affectedCountUnit":20,"hasEnglishDescription":4,"contentLocale":21,"availableLocales":22,"translations":24,"severity":27,"dataClasses":28,"description":32,"seoTitle":33,"seoDescription":34,"logoUrl":35,"isVerified":4,"isSensitive":36,"isSpamList":36,"isMalware":36,"company":37},"6a452308a20f867c8ba8e713","china-software-developer-network","China Software Developer Network Data Breach","csdn.net","2011-12-21T00:00:00.000Z","2025-11-27T05:49:56.000Z",null,"2026-07-03T10:22:37.094Z","2026-07-19T00:02:23.700Z","Third party breach","",[],6414990,"known","unknown","en",[21,23],"tr",{"en":25,"tr":26},{"slug":7},{"slug":7},"Critical",[29,30,31],"Email addresses","Passwords","Usernames","\u003Cp>China Software Developer Network data breach is a verified record from December 2011 associated with csdn.net, a large developer community known as CSDN. The incident affected 6,414,990 user records; email addresses, usernames, and plaintext passwords were exposed. A plaintext password means that an attacker can try the same password on other accounts without having to crack hashes or perform additional processing. In developer communities like CSDN, users may have linked the same email address with code repositories, technical forums, cloud panels, and work accounts. Therefore, an old 2011 breach still poses a security risk today.\u003C\u002Fp>\u003Ch2>Leaking Data Types and Risks\u003C\u002Fh2>\u003Cp>The supported data categories are email addresses, usernames, and passwords. The presence of passwords in plain text is the most critical point. The username indicates the person's technical community identity; the email address allows the attacker to reach the target. These three fields together can be used for password guessing attacks, targeted phishing, and matching developer accounts. If CSDN users have opened their technical accounts with the same username on other platforms, the risk increases. Since phone numbers, addresses, payment information, or code repository content are not listed under this record, they have not been included.\u003C\u002Fp>\u003Ch2>Verified Scope and Boundaries\u003C\u002Fh2>\u003Cp>The CSDN incident is regarded as a long-known and verified breach. The number of records exceeds 6.4 million and the main data classes are public. Nevertheless, it should not be assumed that every user's current work account, private code repository, or financial account was affected. The exposed fields are email, username, and plaintext password. The magnitude of the risk stems from the readability of the password and the likelihood that developer users have reused the same password habits on other technical services.\u003C\u002Fp>\u003Ch2>User Groups at Risk\u003C\u002Fh2>\u003Cp>Developers who had a CSDN account in 2011 and used the same email and password on technical forums, code repositories, cloud panels, domain management, or work emails are at the highest risk. Old technical community accounts are often forgotten; however, passwords can live on other systems for years. Email addresses associated with a developer identity can be used for targeted job offers, fake security alerts, repository access requests, or cloud billing messages. Technical users may be the focus of more complex targeted attacks.\u003C\u002Fp>\u003Ch2>Urgent Measures to Be Taken\u003C\u002Fh2>\u003Cp>Users with a CSDN match should ensure that the password they used in the 2011 period is not used anywhere. If the same or a similar password has been used in a code repository, cloud panel, email, domain, forum, or work account, it should be changed immediately. Two-factor authentication, security keys, or app-based authentication should be preferred for developer accounts. Old passwords may also have been used as SSH key passwords, archive passwords, or local tool passwords; this possibility should also be reviewed.\u003C\u002Fp>\u003Ch2>Long-Term Security Strategies\u003C\u002Fh2>\u003Cp>The impact of password reuse on developer accounts may be broader than on other user accounts. Unique passwords and strong multi-factor authentication should be used for code repositories, cloud infrastructure, and domain management. Old forum passwords should no longer be considered secure. Users should separate personal and work emails and should not match usernames used in technical community accounts exactly with critical systems. Security notifications should be regularly monitored, and unauthorized repository accesses and application permissions should be periodically cleaned up.\u003C\u002Fp>\u003Ch2>Record Control and User Action\u003C\u002Fh2>\u003Cp>If a match with the China Software Developer Network is seen in the LeakData check, the user should consider this as a warning of an old but high-impact plaintext password. The match does not mean that code or payment data has been leaked; however, critical accounts should be checked due to the readable password history. The user should first change all systems where the same password was used, and then strengthen two-factor authentication on developer accounts. New passwords derived from the old password pattern should also not be considered secure.\u003C\u002Fp>","China Software Developer Network Data Breach (6.4 Million Reported Records)","China Software Developer Network Data Breach. 6.4 Million reported records are reported. Reported data: Email addresses, Passwords, Usernames. Review the…","\u002Fuploads\u002Flogo\u002Fcsdn_net.webp",false,{"name":38,"sector":39,"country":40,"website":9,"websiteArchiveUrl":16,"websiteStatus":16,"websiteCheckedAt":12},"China Software Developer Network","Developer Community","China"]