Flaws are everywhere. The point is how quickly they are fixed but it seems that some users are lazy enough not to upgrade or go on for a vacation before they decide to update. bbPress adds a meta generator tag to the page which shows up the bbPress version but it is advised to remove it so that at a later date no one gets to know if you are running an older version which has un-patched flaws & could be exploited.
<meta name="generator" content="bbPress 1.0.2" />
In bbPress 1.0+ you can remove the meta tag generator by adding a single line of code to your functions.php file to your theme’s folder. If there is no functions.php file in your theme folder then create a new one with the name and add this line:
remove_action('bb_head', 'bb_generator');
For those who don’t want to do this by editing a file and would prefer to do it by a plugin, here is a tiny plugin to do the same.