The CHANGELOG for version 5.3 and earlier can be found at https://github.com/symfony/symfony/blob/5.3/src/Symfony/Component/Security/CHANGELOG.md
The CHANGELOG for version 5.3 and earlier can be found at https://github.com/symfony/symfony/blob/5.3/src/Symfony/Component/Security/CHANGELOG.md