Using the bot, if someone has access to the say command, he can use it to issue basic level channel commands like /ban, /kick, etc. You should change the bot settings to that it says who is saying the message or add a space before the message so that commands aren't sent like that.
When I run the bot, I disable the say command for lower access levels. If you have a lower level it should just go "$username says: $text". I do things for a reason. If you're talking about someone else like DK running the bot, he doesn't even have access to this forum.