After announcing that user account information may have been compromised by hackers, link-shortening service Bitly has decided to go the two-factor authentication route.

In a blog post by Chief Technology Officer Rob Platzer, more details regarding the recent data breach were shared, including how the attackers were able to get to the sensitive data.

An unnamed technology company initially alerted Bitly of the breach, and while its security team feared that hackers were able to get to its production user database, it was the database backup storage that was accessed. A review of the security history for the company’s source code repository revealed that there was unauthorized access to an employee’s account.

As a response to the breach, the service will now be working on rolling out two-factor authentication for its users, in addition to other layers of security.