I got a free challenge completion

For fear of others reproducing and exploiting this, could an admin contact me for me to report this. I can supply video evidence of this occuring as well. I am unable to replicate it without another account to test it on.

The chances of staff reaching out to you directly are basically none. You can send the video to support directly if you want.

https://www.pathofexile.com/support

I looked through your challenges and none of the ones you have are difficult to get. So I'll be surprised if it shows up in a patch notes at this point.