diff --git a/src/web-server/routes/codex-routes.ts b/src/web-server/routes/codex-routes.ts
index e7abaf84..26d26815 100644
--- a/src/web-server/routes/codex-routes.ts
+++ b/src/web-server/routes/codex-routes.ts
@@ -1,5 +1,6 @@
 import type { Request, Response } from 'express';
 import { Router } from 'express';
+import { requireLocalAccessWhenAuthDisabled } from '../middleware/auth-middleware';
 import {
   CodexRawConfigConflictError,
   CodexRawConfigValidationError,
@@ -10,6 +11,14 @@ import {
 } from '../services/codex-dashboard-service';
 
 const router = Router();
+const CODEX_CONFIG_ACCESS_ERROR =
+  'Codex configuration endpoints require localhost access when dashboard auth is disabled.';
+
+router.use('/config', (req: Request, res: Response, next) => {
+  if (requireLocalAccessWhenAuthDisabled(req, res, CODEX_CONFIG_ACCESS_ERROR)) {
+    next();
+  }
+});
 
 router.get('/diagnostics', async (_req: Request, res: Response): Promise<void> => {
   try {
diff --git a/tests/unit/web-server/api-routes-remote-write-guard.test.ts b/tests/unit/web-server/api-routes-remote-write-guard.test.ts
index 730c8a62..e1cbe9d9 100644
--- a/tests/unit/web-server/api-routes-remote-write-guard.test.ts
+++ b/tests/unit/web-server/api-routes-remote-write-guard.test.ts
@@ -84,6 +84,21 @@ describe('api-routes remote write guard', () => {
     expect(response.status).toBe(200);
   });
 
+  it('blocks remote Codex raw config reads when dashboard auth is disabled', async () => {
+    const response = await fetch(`${baseUrl}/api/codex/config/raw`);
+
+    expect(response.status).toBe(403);
+    expect(await response.json()).toEqual({
+      error: 'Codex configuration endpoints require localhost access when dashboard auth is disabled.',
+    });
+  });
+
+  it('allows remote Codex diagnostics when dashboard auth is disabled', async () => {
+    const response = await fetch(`${baseUrl}/api/codex/diagnostics`);
+
+    expect(response.status).toBe(200);
+  });
+
   it('blocks remote profile creation when dashboard auth is disabled', async () => {
     const response = await fetch(`${baseUrl}/api/profiles`, {
       method: 'POST',