Originally posted on VentureBeat:

large_6872259969A security breach at cloud-based customer support vendor Zendesk has exposed personal information including email addresses of Twitter, Pinterest, and Tumblr users, the company said today in a blog post.

We’ve become aware that a hacker accessed our system this week. As soon as we learned of the attack, we patched the vulnerability and closed the access that the hacker had. Our ongoing investigation indicates that the hacker had access to the support information that three of our customers store on our system. We believe that the hacker downloaded email addresses of users who contacted those three customers for support, as well as support email subject lines. We notified our affected customers immediately and are working with them to assist in their response.

Zendesk manages backoffice features like customer support and help desk operations via a cloud service it delivers to hundreds of clients serving over 65 million people, the…

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