The best approach to reporting a vulnerability with Masonite is to send an email to contact@masonite.dev describing the issue. The maintainers will get a patch ready and shipped ASAP.
LTS versions will receive security fixes for 3 years and bug fixes for 2 years.
If you are a company looking to work on Masonite long term, it is recommended to first look at the latest LTS version before looking at other versions. Upgrading applications can be costly, and you may decide to stay on the same version of Masonite for extended periods.
It is recommended to stay on the latest version of Masonite to get the most up-to-date features and improvements, but that does not always align with your business's goals.