Updated 2022-09-14: Critical Security updates for Concrete v8 will be issued through end 2023. More info - https://www.concretecms.org/about/project-news/security/security-support-concrete-v8x
Please be aware that Concrete CMS version 8 will be EOL on 31 Dec 2022. We encourage you to plan to upgrade to Concrete version 9 before then. You are going to love the new features that come with version 9!