An hour ago a new user (1 rep) posted a comment on my answer, where the question is asked by another user.
I don't know why this has happened because IMO that user needed 50 rep to post the comment.
None of the cases mentioned in the FAQ where a low-rep user can post a comment applies:
- Both the question and the answer aren't owned by the user
- The user is absolutely new and never had 50 rep
- It's not on Meta Stack Exchange
- The comment is on an answer
screenshot (too big to inline)