diff --git a/api/auth.py b/api/auth.py
index 39922f1b..6dbb79a3 100644
--- a/api/auth.py
+++ b/api/auth.py
@@ -16,7 +16,7 @@ import threading
 import time
 from pathlib import Path
 
-from api.config import STATE_DIR, load_settings
+from api.config import STATE_DIR, get_config, load_settings
 
 logger = logging.getLogger(__name__)
 
@@ -455,6 +455,49 @@ def is_oidc_auth_enabled() -> bool:
         return False
 
 
+def get_oidc_startup_warning() -> str | None:
+    """Return a startup warning when OIDC auth is only partially configured."""
+    try:
+        cfg = get_config()
+        raw = cfg.get("webui_oidc") if isinstance(cfg, dict) else {}
+        if not isinstance(raw, dict):
+            raw = {}
+    except Exception:
+        logger.debug("Failed to read webui_oidc config", exc_info=True)
+        raw = {}
+
+    def pick(name: str, env_name: str) -> str:
+        env_value = os.getenv(env_name)
+        value = env_value if env_value is not None else raw.get(name)
+        return str(value or "").strip()
+
+    issuer = bool(pick("issuer", "HERMES_WEBUI_OIDC_ISSUER"))
+    client_id = bool(pick("client_id", "HERMES_WEBUI_OIDC_CLIENT_ID"))
+    allow_claim = bool(pick("allow_claim", "HERMES_WEBUI_OIDC_ALLOW_CLAIM"))
+    allow_values = bool(pick("allow_values", "HERMES_WEBUI_OIDC_ALLOW_VALUES"))
+
+    if not any((issuer, client_id, allow_claim, allow_values)):
+        return None
+    if issuer and client_id and allow_claim and allow_values:
+        return None
+
+    missing = []
+    if not issuer:
+        missing.append("issuer")
+    if not client_id:
+        missing.append("client_id")
+    if not allow_claim:
+        missing.append("allow_claim")
+    if not allow_values:
+        missing.append("allow_values")
+
+    joined = ", ".join(missing)
+    return (
+        "Native OIDC login is only partially configured; missing "
+        f"{joined}. The WebUI will not enable OIDC auth until all four fields are set."
+    )
+
+
 def is_auth_enabled() -> bool:
     """True if password auth, passkeys, or OIDC login is configured."""
     return (
diff --git a/api/auth_oidc.py b/api/auth_oidc.py
index 58cb8fe5..7eee5748 100644
--- a/api/auth_oidc.py
+++ b/api/auth_oidc.py
@@ -54,34 +54,6 @@ def is_oidc_enabled() -> bool:
         and cfg.get("allow_values")
     )
 
-def get_oidc_startup_warning() -> str | None:
-    cfg = _resolve_oidc_config()
-    issuer = bool(cfg.get("issuer"))
-    client_id = bool(cfg.get("client_id"))
-    allow_claim = bool(cfg.get("allow_claim"))
-    allow_values = bool(cfg.get("allow_values"))
-
-    if not any((issuer, client_id, allow_claim, allow_values)):
-        return None
-    if issuer and client_id and allow_claim and allow_values:
-        return None
-
-    missing = []
-    if not issuer:
-        missing.append("issuer")
-    if not client_id:
-        missing.append("client_id")
-    if not allow_claim:
-        missing.append("allow_claim")
-    if not allow_values:
-        missing.append("allow_values")
-
-    joined = ", ".join(missing)
-    return (
-        "Native OIDC login is only partially configured; missing "
-        f"{joined}. The WebUI will not enable OIDC auth until all four fields are set."
-    )
-
 
 def build_authorization_redirect(
     request_base_url: str,
diff --git a/server.py b/server.py
index ba505b2d..05860d6d 100644
--- a/server.py
+++ b/server.py
@@ -584,8 +584,8 @@ def main() -> None:
     if within_container:
         print('[ok] Running within container.', flush=True)
 
-    from api.auth import is_auth_enabled
-    from api.auth_oidc import get_oidc_startup_warning
+    # Security: warn if binding non-loopback without authentication
+    from api.auth import get_oidc_startup_warning, is_auth_enabled
     if HOST not in ('127.0.0.1', '::1', 'localhost') and not is_auth_enabled():
         print(f'[!!] WARNING: Binding to {HOST} with NO PASSWORD SET.', flush=True)
         print(f'     Anyone on the network can access your filesystem and agent.', flush=True)
diff --git a/tests/test_issue3825_oidc_auth.py b/tests/test_issue3825_oidc_auth.py
index 022cb029..d6545dbf 100644
--- a/tests/test_issue3825_oidc_auth.py
+++ b/tests/test_issue3825_oidc_auth.py
@@ -246,10 +246,10 @@ def test_oidc_enablement_requires_explicit_allowlist(monkeypatch):
     assert auth_oidc.is_oidc_enabled() is False
 
 def test_oidc_startup_warning_flags_partial_config(monkeypatch):
-    import api.auth_oidc as auth_oidc
+    import api.auth as auth
 
     monkeypatch.setattr(
-        auth_oidc,
+        auth,
         "get_config",
         lambda: {
             "webui_oidc": {
@@ -259,16 +259,16 @@ def test_oidc_startup_warning_flags_partial_config(monkeypatch):
         },
     )
 
-    warning = auth_oidc.get_oidc_startup_warning()
+    warning = auth.get_oidc_startup_warning()
     assert warning is not None
     assert "allow_claim" in warning
     assert "allow_values" in warning
 
 def test_oidc_startup_warning_ignores_complete_config(monkeypatch):
-    import api.auth_oidc as auth_oidc
+    import api.auth as auth
 
     monkeypatch.setattr(
-        auth_oidc,
+        auth,
         "get_config",
         lambda: {
             "webui_oidc": {
@@ -280,7 +280,7 @@ def test_oidc_startup_warning_ignores_complete_config(monkeypatch):
         },
     )
 
-    assert auth_oidc.get_oidc_startup_warning() is None
+    assert auth.get_oidc_startup_warning() is None
 
 def test_validate_id_token_rejects_mismatched_jwk_key_family(monkeypatch):
     import api.auth_oidc as auth_oidc