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I wouldn't be surprised if this has already been asked, but I couldn't find it anywhere.

I know that you don't gain or lose rep for questions or answers that you set to community wiki. But does it cost you rep to downvote someone else's cw post?

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14

No.

Voting on a community wiki post (up or down) does not affect any user's reputation.

Source: FAQ

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15

No.

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