Massive Password-Spraying Attacks Hit 80,000 Microsoft Entra ID Accounts

TL;DR

Recent password-spraying attacks have targeted over 80,000 Microsoft Entra ID accounts across hundreds of global organizations. These incidents highlight the growing threat of cybersecurity breaches and the importance of robust security measures.

Large-Scale Password-Spraying Attacks on Microsoft Entra ID Accounts

In a significant cybersecurity incident, hackers have utilized the TeamFiltration pentesting framework to launch password-spraying attacks targeting more than 80,000 Microsoft Entra ID accounts. This widescale attack has affected hundreds of organizations worldwide, underscoring the urgent need for enhanced cybersecurity measures¹.

Understanding Password-Spraying Attacks

Password-spraying is a cyberattack technique where attackers attempt to access a large number of accounts using a few commonly used passwords. This method is particularly effective against accounts with weak or commonly used passwords. The TeamFiltration framework, originally designed for ethical hacking and penetration testing, has been misused in these attacks to exploit vulnerabilities in Microsoft Entra ID accounts.

Impact and Implications

The attack on Microsoft Entra ID accounts highlights several critical issues:

• Widespread Vulnerability: The sheer scale of the attack, affecting over 80,000 accounts, indicates a widespread vulnerability in password security practices.
• Need for Stronger Security Measures: Organizations must implement stronger authentication methods, such as multi-factor authentication (MFA), to protect against such attacks.
• Continuous Monitoring: Regular security audits and continuous monitoring are essential to detect and mitigate potential threats promptly.

Recommendations for Enhanced Security

To safeguard against password-spraying attacks, organizations should consider the following measures:

• Implement Multi-Factor Authentication (MFA): Adding an extra layer of security can significantly reduce the risk of unauthorized access.
• Use Strong, Unique Passwords: Encourage employees to use complex passwords and avoid reusing passwords across different accounts.
• Regular Security Training: Conduct regular training sessions to educate employees about cybersecurity best practices and the risks associated with poor password management.

Conclusion

The recent password-spraying attacks on Microsoft Entra ID accounts serve as a stark reminder of the ever-present threat of cyberattacks. Organizations must remain vigilant and proactive in their approach to cybersecurity to protect sensitive data and maintain trust with their stakeholders.

References

1. (2025, June 12). “Password-spraying attacks target 80,000 Microsoft Entra ID accounts”. BleepingComputer. Retrieved 2025-06-12. ↩︎