All the code is open source, everyone is welcome to look through it for potential problems and report/fix them. we dont have any money to pay for a professional audit. Maybe there are some organizations which would do audits of open source projects for free, might be worth searching for.
That depends, it would be annoying if you open lots of issues for minor, unimportant issues. But if you find a few major problems its good to report them. Of course its always ideal if you submit fixes as well, because there are never enough devs.
Lemmy 0.18.2 Security Release (join-lemmy.org)