CBSubs changelog remains private as we've too many tickets that contain sensitive information. We'll eventually be providing a public access forge of CBSubs at a later time. Changelog is only provided at time of stable release for CBSubs.

We provide such info on every stable release and again we'll have a public forge when possible. We either need to scrub the existing CBSubs forge or what we'll likely do is just make a new one.

As for this latest CBSubs build it's just fixing some of the backend filters that kept throwing errors, but requires CB to also be updated for those fixes. CB changes you can find below.

forge.joomlapolis.com/projects/cb/issues?query_id=108

In this case, is there a way to only opt for stable releases in web updates shown in the website backend ?

No.

The live website shows nightly builds to be upgraded but without a proper changelog it's sometimes too risky

Our nightlies aren't nightlies in the traditional sense. They're not experimental releases or anything of the sort. Our build releases go through the same testing and review process as stable releases. I understand the changelog issue, but we've years of sensitive data in our forge for CBSubs; we'll be reviewing making a public accessible forge for CBSubs soon.