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It’s a security hole and it’s closed by default. If you choose to open it you can modify the filters that bp uses. Example is the forums filter system:

bp_forums_add_allowed_tags() in ../bp-forums/bp-forums-filters.php is the filter you can extend.

function my_allowed_tags($allowedtags){

$allowedtags = array();

return $allowedtags;

}

add_filter( ‘edit_allowedtags’, ‘my_allowed_tags’ );

Create a file called bp-custom.php and put it in the /mu-plugins directory with the rest of the main bp files. Put that function in there. It’ll get loaded by bp.

Other components have a /bp-<component>/bp-<component>-filters.php file also.