Zello, the popular push-to-talk communication platform serving 140 million users worldwide, has issued an urgent security advisory requiring password resets for its user base. The alert specifically targets all accounts created before November 2nd, 2024, affecting a broad spectrum of users including first responders, hospitality workers, and transportation personnel.

On November 15th, the company released a security notice mandating immediate password changes and recommending users who have reused their Zello credentials elsewhere to update those accounts as well. While specific details about the security concern remain undisclosed, this incident follows a previous breach in 2020 where email addresses and hashed passwords were compromised.

The timing of the announcement and the November 2nd cutoff date suggests a possible data breach or credential stuffing attack. Users are strongly advised to:
• Reset their Zello passwords immediately
• Update passwords on other platforms where similar credentials were used
• Implement robust password security measures

The company continues to investigate the situation, though the full scope and nature of the potential breach remain unclear. This security incident particularly impacts Zello’s core user base of professional and emergency service workers who rely on the platform for critical communications.