Prometheus -- arbitrary redirects

Prometheus reports:

    Prometheus is an open-source monitoring system and time series
    database. In 2.23.0, Prometheus changed its default UI to the New
    ui. To ensure a seamless transition, the URL's prefixed by /new
    redirect to /. Due to a bug in the code, it is possible for an
    attacker to craft an URL that can redirect to any other URL, in the
    /new endpoint. If a user visits a prometheus server with a
    specially crafted address, they can be redirected to an arbitrary
    URL. The issue was patched in the 2.26.1 and 2.27.1 releases. In
    2.28.0, the /new endpoint will be removed completely. The
    workaround is to disable access to /new via a reverse proxy in
    front of Prometheus.