diff --git a/x-pack/plugins/fleet/server/routes/preconfiguration/index.ts b/x-pack/plugins/fleet/server/routes/preconfiguration/index.ts
index 5d427b49bed69..2d46599988f1a 100644
--- a/x-pack/plugins/fleet/server/routes/preconfiguration/index.ts
+++ b/x-pack/plugins/fleet/server/routes/preconfiguration/index.ts
@@ -17,6 +17,9 @@ export const registerRoutes = (router: FleetAuthzRouter) => {
     {
       path: PRECONFIGURATION_API_ROUTES.RESET_PATTERN,
       validate: false,
+      options: {
+        access: 'internal',
+      },
       fleetAuthz: {
         fleet: { all: true },
       },
@@ -27,6 +30,9 @@ export const registerRoutes = (router: FleetAuthzRouter) => {
     {
       path: PRECONFIGURATION_API_ROUTES.RESET_ONE_PATTERN,
       validate: PostResetOnePreconfiguredAgentPoliciesSchema,
+      options: {
+        access: 'internal',
+      },
       fleetAuthz: {
         fleet: { all: true },
       },
diff --git a/x-pack/plugins/fleet/server/services/security/fleet_router.test.ts b/x-pack/plugins/fleet/server/services/security/fleet_router.test.ts
index 6af9c891b31fc..bb6ea59eeec82 100644
--- a/x-pack/plugins/fleet/server/services/security/fleet_router.test.ts
+++ b/x-pack/plugins/fleet/server/services/security/fleet_router.test.ts
@@ -201,4 +201,64 @@ describe('FleetAuthzRouter', () => {
       ).toEqual('forbidden');
     });
   });
+
+  describe('default access', () => {
+    let fakeRouter: jest.Mocked<IRouter<FleetRequestHandlerContext>>;
+    beforeEach(() => {
+      fakeRouter = {
+        get: jest.fn(),
+        post: jest.fn(),
+        delete: jest.fn(),
+        put: jest.fn(),
+        patch: jest.fn(),
+      } as unknown as jest.Mocked<IRouter<FleetRequestHandlerContext>>;
+    });
+
+    const METHODS: Array<'get' | 'post' | 'delete' | 'put' | 'patch'> = [
+      'get',
+      'post',
+      'delete',
+      'put',
+      'patch',
+    ];
+
+    for (const method of METHODS) {
+      describe(`${method}`, () => {
+        it('should set default access to public', () => {
+          const fleetAuthzRouter = makeRouterWithFleetAuthz(fakeRouter, mockLogger);
+          fleetAuthzRouter[method](
+            {
+              path: '/test',
+              validate: false,
+            },
+            (() => {}) as any
+          );
+          expect(fakeRouter[method]).toBeCalledWith(
+            expect.objectContaining({
+              options: { access: 'public' },
+            }),
+            expect.anything()
+          );
+        });
+
+        it('should not allow to define internal routes', () => {
+          const fleetAuthzRouter = makeRouterWithFleetAuthz(fakeRouter, mockLogger);
+          fleetAuthzRouter[method](
+            {
+              path: '/test',
+              validate: false,
+              options: { access: 'internal' },
+            },
+            (() => {}) as any
+          );
+          expect(fakeRouter[method]).toBeCalledWith(
+            expect.objectContaining({
+              options: { access: 'internal' },
+            }),
+            expect.anything()
+          );
+        });
+      });
+    }
+  });
 });
diff --git a/x-pack/plugins/fleet/server/services/security/fleet_router.ts b/x-pack/plugins/fleet/server/services/security/fleet_router.ts
index 32fd25a38a948..a956f1522161c 100644
--- a/x-pack/plugins/fleet/server/services/security/fleet_router.ts
+++ b/x-pack/plugins/fleet/server/services/security/fleet_router.ts
@@ -13,6 +13,8 @@ import type {
   Logger,
   RequestHandler,
   RouteMethod,
+  RouteConfig,
+  RouteConfigOptions,
 } from '@kbn/core/server';
 
 import type { FleetRequestHandlerContext } from '../..';
@@ -26,6 +28,25 @@ import {
   doesNotHaveRequiredFleetAuthz,
 } from './security';
 
+function withDefaultPublicAccess<P, Q, B, Method extends RouteMethod>(
+  routeConfig: RouteConfig<P, Q, B, Method>
+): RouteConfig<P, Q, B, Method> {
+  let newOptions: RouteConfigOptions<Method>;
+  if (routeConfig?.options) {
+    newOptions = { ...routeConfig?.options };
+  } else {
+    newOptions = {};
+  }
+
+  if (!newOptions.access) {
+    newOptions.access = 'public';
+  }
+  return {
+    ...routeConfig,
+    options: newOptions,
+  };
+}
+
 export function makeRouterWithFleetAuthz<TContext extends FleetRequestHandlerContext>(
   router: IRouter<TContext>,
   logger: Logger
@@ -106,27 +127,27 @@ export function makeRouterWithFleetAuthz<TContext extends FleetRequestHandlerCon
 
   const fleetAuthzRouter: FleetAuthzRouter<TContext> = {
     get: ({ fleetAuthz: hasRequiredAuthz, ...options }, handler) => {
-      router.get(options, (context, request, response) =>
+      router.get(withDefaultPublicAccess(options), (context, request, response) =>
         fleetHandlerWrapper({ context, request, response, handler, hasRequiredAuthz })
       );
     },
     delete: ({ fleetAuthz: hasRequiredAuthz, ...options }, handler) => {
-      router.delete(options, (context, request, response) =>
+      router.delete(withDefaultPublicAccess(options), (context, request, response) =>
         fleetHandlerWrapper({ context, request, response, handler, hasRequiredAuthz })
       );
     },
     post: ({ fleetAuthz: hasRequiredAuthz, ...options }, handler) => {
-      router.post(options, (context, request, response) =>
+      router.post(withDefaultPublicAccess(options), (context, request, response) =>
         fleetHandlerWrapper({ context, request, response, handler, hasRequiredAuthz })
       );
     },
     put: ({ fleetAuthz: hasRequiredAuthz, ...options }, handler) => {
-      router.put(options, (context, request, response) =>
+      router.put(withDefaultPublicAccess(options), (context, request, response) =>
         fleetHandlerWrapper({ context, request, response, handler, hasRequiredAuthz })
       );
     },
     patch: ({ fleetAuthz: hasRequiredAuthz, ...options }, handler) => {
-      router.patch(options, (context, request, response) =>
+      router.patch(withDefaultPublicAccess(options), (context, request, response) =>
         fleetHandlerWrapper({ context, request, response, handler, hasRequiredAuthz })
       );
     },