Twilio Suffers Data Breach After Employees Fall Victim to SMS Phishing Attack

Twilio SMS Phishing Attack

Twilio SMS Phishing Attack


Customer engagement platform Twilio on Monday disclosed that a “sophisticated” threat actor gained “unauthorized access” using an SMS-based phishing campaign aimed at its staff to gain information on a “limited number” of accounts.

The social-engineering attack was bent on stealing employee credentials, the company said, calling the as-yet-unidentified adversary “well-organized” and “methodical in their actions.” The incident came to light on August 4.

“This broad-based attack against our employee base succeeded in fooling some employees into providing their credentials,” it said in a notice. “The attackers then used the stolen credentials to gain access to some of our internal systems, where they were able to access certain customer data.”


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The communications giant has 268,000 active customer accounts, and counts companies like Airbnb, Box, Dell, DoorDash, eBay, Glassdoor, Lyft, Salesforce, Stripe, Twitter, Uber, VMware, Yelp, and Zendesk among its clients. It also owns the popular two-factor authentication (2FA) service Authy.

Twilio, which is still continuing its investigation into the hack, noted it’s working directly with customers who were impacted. It didn’t disclose the scale of the attack, the number of employee accounts that were compromised, or what types of data may have been accessed.

Phishing schemes, both leveraging email and SMS, are known to lean on aggressive scare tactics to coerce victims into handing over their sensitive information. This is no exception.

The SMS messages are said to have been sent to both current and former employees masquerading as coming from its IT department, luring them with password expiry notifications to click on malicious links.

The URLs included words such as “Twilio,” “Okta,” and “SSO” (short for single sign-on) to increase the chance of success and redirected the victims to a phony website that impersonated the company’s sign-in page. It’s not immediately clear if the breached accounts were secured by 2FA protections.

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Twilio SMS Phishing Attack

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