We always recommend using the latest version of Symphony to ensure you get all security updates.
Please do not file GitHub issues or post on our public forum for security vulnerabilities, as they are public!
Symphony takes security issues very seriously. If you have any concerns about Symphony or believe you have uncovered a vulnerability, please get in touch via DMs @kriptonian8. In the message, try to provide a description of the issue and ideally a way of reproducing it. The maintainers or me will get back to you as soon as possible.
Note that this security address should be used only for undisclosed vulnerabilities. Please report any security problems to us before disclosing it publicly.