How do I reset or update credentials without access to the webui?

[ghost]

I've had CasaOS running on Ubuntu Server for months without problems. For the past couple of weeks however I have been unable to log in. I suspect this happened after updating because other than that it has been left alone. The credentials are correct and the disk has sufficient space (mentioning this because it has locked me out of containers in the past). How can I resolve this without wiping the data? I can access the server itself via ssh.