The attackers used a common vulnerability called SQL injection to gain access to the database.
Searching for or downloading files labeled "390K Yahoo com rar" today is highly discouraged for several reasons: Download 390K Yahoo com rar
Always use Multi-Factor Authentication (MFA) on your accounts to provide a layer of security even if a password is stolen. The attackers used a common vulnerability called SQL
If you are concerned about whether your data was part of this or more recent breaches: Use legitimate services like Have I Been Pwned
Downloading or distributing stolen personal data can lead to legal consequences under data privacy and computer misuse laws.
Use legitimate services like Have I Been Pwned to see if your email address has appeared in any known data leaks.
While the total leak was larger, the specific archive often circulated in hacker forums or security archives is frequently referred to as the "390K" or "450K" Yahoo leak. Why You Should Be Cautious