I noticed on our older version (still trying to upgrade) of MonoX at http://social.clipflair.net that when you press the "mark as answer" in the forums multiple times the reputation of that person keeps growing. I think it's been fixed at newer versions to show unmark as answer instead or something, but wonder if one (say a moderator) can exploit this to pump up reputation by sending forged requests to mark as answer (bypassing the UI or editing the UI on the fly with web developer tools of browsers).

The backend should include extra sanity checks like say if there's a method called MarkAsAnswer(somePostId) to check first if already marked and do nothing (and not just expect the UI to work since the UI runs on the client and can be tweeked by end users).

This might be important in other places of the site security-wise too