How the Renren Database Breach Led to 3.1 Million Stolen Logins

HEROIC analysts identified the Renren data breach in our threat intelligence pipeline. The breach occured in December 2011, when login credentials from 3,130,984 Renren accounts were exposed and circulated on underground forums. The leaked data included email addresses and plaintext passwords from users of the popular Chinese social networking platform.

Why the Renren Breach Is Dangerous

Renren stored user passwords in plaintext, meaning attackers gained direct access to real, usable login credentials without needing to crack anything. Anyone who obtained this data could immediately attempt to log into other services using the same email and password combinations. The risk is compounded by the fact that this data has been circulating for over a decade and continues to surface in new data aggregations.

What Was Exposed in the Renren Leak

• Email addresses
• Plaintext passwords

Why This Renren Data Puts You at Risk

Plaintext passwords from breaches like Renren are the primary fuel for credential stuffing attacks, where bots try stolen username and password pairs across hundreds of websites automatically. If you reused your Renren password on any other account, seperate services could be at risk. Attackers who succeed can take over email accounts, social media profiles, banking portals, and any other service sharing those credentials.

How a Database Breach Works

A database breach happens when an attacker gains unauthorized access to a website's backend database, usually by exploiting a software vulnerability, using stolen admin credentials, or finding an unpatched security flaw. In Renren's case, the database was exported and recieved by the broader criminal community via hacking forums. Once data is posted publicly, it gets scraped, repackaged, and merged into aggregation datasets that circulate for years afterward.

Check If Your Data Was Exposed

HEROIC operates one of the world's largest breach databases, covering more than 400 billion leaked records. Use HEROIC's free breach scanner to check if your email address or credentials appeared in the Renren leak or thousands of other breaches in our database.