Breach Intelligence

6,875

Total breached databases

In late 2016, the online Chinese video service Youku suffered a data breach. The incident exposed 92 million unique user accounts and corresponding MD5 password hashes.
  • Data: Email Addresses Passwords
  • Records: 100,244,003
  • Lines: 100,244,186
  • Size: 4.96 GB
  • Passwords: MD5
  • Cracked: 96%
In February 2012, the Chinese advertising website CNZZ suffered a data breach that impacted 946k users. The breach included Usernames, Email addresses and Passwords stored as MD5 hashes.
  • Date: Feb 2012
  • Domain: cnzz.com
  • Country: China
  • Category: E-commerce & Retail
  • Source: cnzz.com
  • Data: Email Addresses Passwords Usernames
  • Records: 946,482
  • Lines: 946,488
  • Size: 98.52 MB
  • Passwords: MD5
  • Cracked: 0%
In September 2016, data was allegedly obtained from the Chinese website known as uuu9.com and contained 7.5M accounts. Whilst there is evidence that the data is legitimate, due to the difficulty of emphatically verifying the Chinese breach it has been flagged as "unverified". The data in the breach contains email addresses and user names.
  • Data: Email Addresses Passwords Usernames
  • Records: 18,333,811
  • Lines: 18,333,811
  • Size: 1.28 GB
  • Passwords: Plaintext
In approximately 2011, data was allegedly obtained from the Chinese gaming website known as Duowan.com and contained 2.6M accounts. Whilst there is evidence that the data is legitimate, due to the difficulty of emphatically verifying the Chinese breach it has been flagged as "unverified". The data in the breach contains email addresses, user names and plain text passwords.
  • Data: Email Addresses Passwords Usernames
  • Records: 8,307,650
  • Lines: 8,307,711
  • Size: 444.46 MB
  • Passwords: Plaintext
In December 2011, 178.com, a Chinese gaming website, suffered a data breach affecting approximately 9 million users. Reports indicate that the exposed data included usernames and passwords stored in plaintext, raising significant security concerns.
  • Date: Dec 2011
  • Domain: 178.com
  • Country: China
  • Category: Gaming
  • Data: Passwords Usernames
  • Records: 9,072,966
  • Lines: 9,072,966
  • Size: 254.44 MB
  • Passwords: Plaintext
In December 2011 the Chinese Software Developer Network (csdn.net) website suffered a data breach that leaked 6.4 million of their users records including plaintext passwords, email addresses and usernames.
  • Data: Email Addresses Passwords Usernames
  • Records: 6,428,632
  • Lines: 6,428,632
  • Size: 273.93 MB
  • Passwords: Plaintext
In October 2016, data surfaced that was allegedly obtained from the Chinese website known as GFAN and contained 22.5M accounts. Whilst there is evidence that the data is legitimate, due to the difficulty of emphatically verifying the Chinese breach it has been flagged as "unverified". The data in the breach contains email and IP addresses, user names and salted and hashed passwords.
  • Data: Email Addresses IP Addresses Passwords Usernames
  • Records: 22,699,932
  • Lines: 22,722,399
  • Size: 1.93 GB
  • Passwords: vBulletin
  • Cracked: 56%

Frequently Asked Questions

A data breach is unauthorized access to data (often involving account takeover, malware, or misconfigured infrastructure). A data leak is exposure of data due to mistakes like public cloud storage, open databases, or accidental publishing. A database dump is a packaged dataset that may come from a breach, leak, scraping, or aggregation.

Change passwords for any affected accounts immediately, prioritizing email, banking, and any account that shares the same password. Enable multi-factor authentication wherever possible. Monitor your accounts for suspicious activity and consider placing a fraud alert or credit freeze if financial data was exposed.

Start with containment and verification: confirm what data was exposed, identify the entry point, rotate credentials (especially SSO, VPN, email), and enforce MFA. Then investigate affected systems, notify stakeholders as required, and harden controls to prevent recurrence. A structured incident response plan helps keep the work measurable and compliant.

Dark web monitoring helps you spot exposure signals early — before stolen data is widely reused for account takeover or targeted attacks. Monitoring complements vulnerability management by revealing when attackers already have leverage. Pair it with continuous attack surface monitoring and strong Asset Discovery to reduce blind spots.

Not always. Some datasets are old, incomplete, or derived from third parties. However, any exposure increases risk because credentials and personal data can be reused indefinitely. Treat it as a priority signal: rotate credentials, enforce MFA, review suspicious logins, and audit the systems that could have produced the data.

SynScan helps you connect the dots between attack surface exposure, vulnerabilities, and breach signals so you can prioritize remediation and reduce the chance of repeat incidents.