Yes Wago.io is on Cloudflare’s CDN and therefore affected by the recently announced Cloudbleed. I’ll keep this short since you’ve probably seen the announced vulnerability mentioned a bajillion times already.
Wago.io is not forcing password resets for everyone but if you use a local Wago account instead of a Battle.net or other social login it’s a good idea to do so. Keep in mind Wago does not collect e-mail addresses or other forms on identification so there’s no way to reset your password should you lose it.
For more information on Cloudbleed, this post has the best write-up I’ve found on the situation.