Twilio's Authy App Breach: Millions of Phone Numbers Exposed

Posted on: 05 Jul 2024 | Author: Foresiet

Twilio, the cloud communications provider, has disclosed a security breach affecting its Authy app, exposing users' phone numbers due to an exploit in an unauthenticated endpoint.

Understanding the Authy App Breach

Twilio confirmed unauthorized access to an endpoint within Authy, leading to the exposure of data linked to Authy accounts, specifically users' cell phone numbers. This breach was exploited by threat actors who subsequently published a database containing 33 million phone numbers allegedly sourced from Authy accounts.

Twilio's Response and Mitigation Efforts

In response, Twilio swiftly secured the vulnerable endpoint to prevent further unauthorized access. They clarified that the breach did not extend to Twilio's core systems or sensitive data. However, as a precautionary measure, Twilio recommended all Authy users update their Android and iOS apps to the latest versions to enhance security.

Impact on Users and Security Recommendations

While no evidence suggests broader data compromise, Twilio cautioned users to remain vigilant against potential phishing and smishing attacks leveraging the exposed phone numbers. Users are advised to scrutinize any suspicious texts they receive and to be cautious of communication purporting to be from Authy.

Cybersecurity Best Practices

In light of this incident, reinforcing cybersecurity measures such as stolen credentials detection, dark web surveillance, and digital threat scoring becomes crucial. Implementing robust brand protection and online risk evaluation strategies is essential to mitigate risks associated with data breaches and unauthorized access.


The security breach affecting Twilio's Authy app underscores the importance of proactive cybersecurity measures and user vigilance in the face of evolving cyber threats. Stay informed and take necessary steps to safeguard your digital identity and sensitive information.

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