LastPass has been very diligent in fixing issues like the one you list. Usually very quickly (sometimes in hours, not even days.) And most of the issues you've

LastPass has been very diligent in fixing issues like the one you list. Usually very quickly (sometimes in hours, not even days.) And most of the issues you've read about with LastPass have been fixed before being disclosed because of how responsive they are. Users still need to practice skepticism and ultimately it is their responsibility to protect their passwords. But LastPass has been a very good citizen when it comes to being as secure as possible.