A group known as D33Ds Company claimed responsibility for the breach.

If you are researching this file for personal security or academic reasons, here are the steps generally recommended to mitigate risks from such leaks:

The leaked .txt file contained roughly 453,000 entries (often cited as ~418k unique accounts) consisting of: Plaintext usernames/email addresses. Plaintext passwords (unencrypted). Associated internal Yahoo data. Impact and Security Significance

This event was a landmark security case because it highlighted the dangers of storing user passwords in —unencrypted text that anyone can read. Even though the hack targeted a side service (Yahoo Voices), many affected users had their primary Yahoo account credentials compromised because of password reuse. Security Recommendations

Ensure you are no longer using any password that may have been in that 2012 file. Transition to a reputable password manager to generate unique, complex passwords for every site.

The hackers utilized a Union-based SQL Injection attack to bypass security and access the platform's database.

Activate Multi-Factor Authentication (MFA) on your Yahoo account and all other critical services.