Customer service software provider Zendesk announced a security breach that allowed attackers into its system, where they could access data from three customers this week. Wired learned those three clients were Twitter, Pinterest and Tumblr.

The San Francisco-based company announced the breach in a blog post published early Thursday night. Tumblr notified affected users in a tweet at 6:35 p.m. Pacific time; Twitter and Pinterest are expected to do so shortly. Zendesk declined to comment beyond its blog post, titled, appropriately, “We’ve been hacked.” - Mat Honan for Wired