EUNE Server hacked?

My username was changed to "tookulol48". From what I found online there is no way to change the username so how did this happen? Also the new username clearly states that it was hacked ("took-u-lol"). So what happened? I cant find any announcement that the EUNE servers have been hacked..

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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