fix(proxy): /get_logo_url no longer discloses local UI_LOGO_PATH

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>

litellm/proxy/proxy_server.py

@@ -12223,9 +12223,20 @@ async def claim_onboarding_link(data: InvitationClaim):
 
 @app.get("/get_logo_url", include_in_schema=False)
 def get_logo_url():
-    """Get the current logo URL from environment"""
+    """Get the current logo URL from environment.
+
+    Only HTTP(S) URLs are returned — those are intended to be loaded
+    directly by the browser from a public/internal CDN. Local file
+    paths set via ``UI_LOGO_PATH`` are NOT returned: they are admin-
+    only filesystem details, the dashboard falls back to ``/get_image``
+    which serves the file (with path containment) instead. Without
+    this filter, the unauthenticated endpoint would disclose internal
+    hostnames or filesystem paths to any caller.
+    """
     logo_path = os.getenv("UI_LOGO_PATH", "")
-    return {"logo_url": logo_path}
+    if logo_path.startswith(("http://", "https://")):
+        return {"logo_url": logo_path}
+    return {"logo_url": ""}
 
 
 @app.get("/get_image", include_in_schema=False)

tests/test_litellm/proxy/test_proxy_server.py

@@ -457,6 +457,60 @@ def test_fallback_login_has_no_deprecation_banner(client_no_auth):
     assert "<form" in html
 
 
+@pytest.mark.parametrize(
+    "ui_logo_path",
+    [
+        "/etc/litellm/secret-config.json",
+        "/var/secrets/admin.key",
+        "/proc/self/environ",
+        "relative/path/logo.png",
+    ],
+)
+def test_get_logo_url_does_not_disclose_local_paths(
+    client_no_auth, monkeypatch, ui_logo_path
+):
+    # ``/get_logo_url`` is unauthenticated. Returning a local filesystem
+    # path verbatim discloses admin-only config to any caller. Only
+    # browser-loadable HTTP(S) URLs should be returned; for local paths
+    # the dashboard falls back to ``/get_image`` (which has path
+    # containment).
+    monkeypatch.setenv("UI_LOGO_PATH", ui_logo_path)
+
+    response = client_no_auth.get("/get_logo_url")
+
+    assert response.status_code == 200
+    assert response.json() == {"logo_url": ""}
+
+
+def test_get_logo_url_returns_https_url(client_no_auth, monkeypatch):
+    monkeypatch.setenv("UI_LOGO_PATH", "https://cdn.public.example/logo.png")
+
+    response = client_no_auth.get("/get_logo_url")
+
+    assert response.status_code == 200
+    assert response.json() == {"logo_url": "https://cdn.public.example/logo.png"}
+
+
+def test_get_logo_url_returns_http_url(client_no_auth, monkeypatch):
+    # HTTP URLs (typically internal CDN) are still returned — those are
+    # intended to be loaded directly by the browser.
+    monkeypatch.setenv("UI_LOGO_PATH", "http://internal-cdn.corp:8080/logo.png")
+
+    response = client_no_auth.get("/get_logo_url")
+
+    assert response.status_code == 200
+    assert response.json() == {"logo_url": "http://internal-cdn.corp:8080/logo.png"}
+
+
+def test_get_logo_url_returns_empty_when_unset(client_no_auth, monkeypatch):
+    monkeypatch.delenv("UI_LOGO_PATH", raising=False)
+
+    response = client_no_auth.get("/get_logo_url")
+
+    assert response.status_code == 200
+    assert response.json() == {"logo_url": ""}
+
+
 def test_sso_key_generate_shows_deprecation_banner(client_no_auth, monkeypatch):
     # Ensure the route returns the HTML form instead of redirecting
     monkeypatch.setattr(