"hack tool detected"

I got this message recently for the first time under suspicious circumstances. I was running chrome and VLC (for mp3) in the background at the time. Needless to say I have no such cheats.

I called to a vote to kick a player that was moving as if he was lagging, very hard to hit. The second the kick was approved this dialogue popped up saying 'hack tool detected'. Is this a known vulnerability that can be triggered remotely by some hack?

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