The Interpals Breach: 609,458 Accounts and Passwords Exposed

HEROIC analysts identified a database breach affecting Interpals, a social networking site for international pen pals and language exchange, dated November 3, 2015. The breach exposed 609,458 records, including first names, birthdates, email addresses, usernames, and passwords hashed with MD5 and MD5(PHPBB3).

Why the Interpals Breach Is Dangerous

MD5 is an outdated hashing algorithm that modern computers can crack quickly, especially for common passwords. Combined with a first name, birthdate, and email address, a cracked password gives an attacker enough personal detail to attempt account takeover elsewhere or to build a convincing, personalized phishing message.

What Was Exposed in the Interpals Leak

• First names
• Birthdates
• Email addresses
• Usernames
• Passwords, hashed with MD5 and MD5(PHPBB3)

Why This Matters

Because Interpals connects users across countries for personal conversation, the combination of a real first name, birthdate, and email address is far more identity-revealing than a typical forum account. If a cracked password matches one used elsewhere, the risk extends from this site to email, social media, and financial accounts through simple credential stuffing.

How Database Breaches Like This Happen

A database breach occurs when an attacker gains direct access to a site's backend storage and extracts the full user table at once. The use of MD5 hashing across more than 600,000 accounts here reflects password security practices that were already considered outdated by the time of this 2015 incident, making the exposed hashes easier to crack than newer methods like bcrypt.

Check If You Are Affected

If you ever had an Interpals account, check your exposure today. HEROIC's free breach scanner checks your email against more than 400 billion compromised records, including this one, so you can act before an old password becomes a problem.