There is a bug where if you put an external forum link, this becomes visible to all other players on the alliance info page. This is also invisible to anyone inside the alliance:
How it looks from inside your alliance:
How it looks to players outside of your alliance:
This means that if you have a forum with sensitive information on your alliance, this becomes visible to anyone outside of your alliance. This cannot be removed through bb codes in alliance administration as it does not show up there. This should not visible and is clearly a bug. Furthermore, it is invisible to anyone inside the alliance and, therefore, the players and leaders of that alliance are unaware that other players can read this information.