The unauthenticated ``/get_logo_url`` endpoint returned the
``UI_LOGO_PATH`` env var verbatim. For HTTP(S) URLs this is intended —
the dashboard loads the logo directly from a public/internal CDN. For
local filesystem paths it was an information disclosure: any caller
could fetch ``/get_logo_url`` and read admin-only filesystem details
like ``UI_LOGO_PATH=/etc/litellm/secret-config.json``.
Now the endpoint returns the URL only when it begins with
``http://`` or ``https://``. For local paths (or unset) it returns an
empty string — the dashboard falls back to ``/get_image`` which
serves the file via the path-containment guard added in the previous
commit.
Tests parametrize the disclosure-blocked cases (``/etc/...``,
``/proc/self/environ``, relative paths) and confirm HTTP / HTTPS URLs
still pass through unchanged.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
