Non-definer of a view was allowed to alter that view. Due to this the alterer
can elevate his access rights to access rights of the view definer and thus
modify data which he wasn't allowed to modify. A view defined with
SQL SECURITY INVOKER can't be used directly for access rights elevation.
But a user can first alter the view SQL code and then alter the view to 
SQL SECURITY DEFINER and thus elevate his access rights. Due to this
altering a view with SQL SECURITY INVOKER is also prohibited.

Now the mysql_create_view function allows ALTER VIEW only to the view
definer or a super user.