Account Takeover Risk: The LemonBan Breach Exposed 7,693 Records

HEROIC discovered 7,693 records in LemonBan on January 18, 2025, leaking email addresses, phone numbers, usernames, and MD5 password hashes pulled from the Chinese tech education platform's user database.

Why This LemonBan Database Breach Is Dangerous

MD5 is considered broken for password storage. With commodity hardware, attackers can crack the hashes in this dump within hours, turning every LemonBan user record into a usable email, phone, and plaintext password triple that cleanly enables downstream account takeovers.

What Was Exposed in LemonBan

• Email addresses tied to LemonBan student and instructor accounts
• Phone numbers usable for smishing and SIM swap attacks
• Usernames that can be matched to public GitHub or forum profiles
• MD5 password hashes that modern cracking rigs defeat in hours

Why This Matters

The consequence here is straightforward. Once MD5 hashes crack, attackers will try the same email and password pair against Chinese banking apps, cloud providers, and corporate VPNs. LemonBan users who reused passwords across services now face real financial and professional exposure.

How Database Breaches With MD5 Hashes Unfold

The attacker dumps the full user table, separates the MD5 column, and loads it into hashcat. Common passwords fall almost instantly, then rules-based attacks and rainbow tables clean up the rest. Cracked credentials are merged with the emails and usernames, then sold as a targeted combo list on underground forums.

Check If You Are Affected

HEROIC scans more than 400 billion compromised records across the surface, deep, and dark web. Run your email through the HEROIC exposure scanner to see if your LemonBan login appeared in the leak, then rotate any reused passwords before the hashes are fully cracked.