diff --git a/x-pack/plugins/fleet/public/mock/plugin_interfaces.ts b/x-pack/plugins/fleet/public/mock/plugin_interfaces.ts
index 054ef958c1914..2373f8dd309ba 100644
--- a/x-pack/plugins/fleet/public/mock/plugin_interfaces.ts
+++ b/x-pack/plugins/fleet/public/mock/plugin_interfaces.ts
@@ -14,7 +14,7 @@ export const createStartMock = (extensionsStorage: UIExtensionsStorage = {}): Mo
   return {
     isInitialized: jest.fn().mockResolvedValue(true),
     registerExtension: createExtensionRegistrationCallback(extensionsStorage),
-    authz: {
+    authz: Promise.resolve({
       fleet: {
         all: true,
         setup: true,
@@ -31,6 +31,6 @@ export const createStartMock = (extensionsStorage: UIExtensionsStorage = {}): Mo
         readIntegrationPolicies: true,
         writeIntegrationPolicies: true,
       },
-    },
+    }),
   };
 };
diff --git a/x-pack/plugins/fleet/public/mock/types.ts b/x-pack/plugins/fleet/public/mock/types.ts
index 5071eb71fece1..44d88acae1617 100644
--- a/x-pack/plugins/fleet/public/mock/types.ts
+++ b/x-pack/plugins/fleet/public/mock/types.ts
@@ -15,4 +15,5 @@ export type MockedFleetSetupDeps = MockedKeys<FleetSetupDeps>;
 
 export type MockedFleetStartDeps = MockedKeys<FleetStartDeps>;
 
-export type MockedFleetStart = MockedKeys<FleetStart>;
+// Don't wrap the `authz` property which is a promise with `jest.Mocked`
+export type MockedFleetStart = MockedKeys<Omit<FleetStart, 'authz'>> & Pick<FleetStart, 'authz'>;
diff --git a/x-pack/plugins/fleet/public/plugin.ts b/x-pack/plugins/fleet/public/plugin.ts
index e188b8e99b5b9..2330cd3690c77 100644
--- a/x-pack/plugins/fleet/public/plugin.ts
+++ b/x-pack/plugins/fleet/public/plugin.ts
@@ -24,6 +24,8 @@ import type {
 
 import type { SharePluginStart } from 'src/plugins/share/public';
 
+import { once } from 'lodash';
+
 import type { UsageCollectionSetup } from '../../../../src/plugins/usage_collection/public';
 
 import { DEFAULT_APP_CATEGORIES, AppNavLinkStatus } from '../../../../src/core/public';
@@ -72,7 +74,7 @@ export interface FleetSetup {}
  */
 export interface FleetStart {
   /** Authorization for the current user */
-  authz: FleetAuthz;
+  authz: Promise<FleetAuthz>;
   registerExtension: UIExtensionRegistrationCallback;
   isInitialized: () => Promise<true>;
 }
@@ -144,7 +146,7 @@ export class FleetPlugin implements Plugin<FleetSetup, FleetStart, FleetSetupDep
           ...startDepsServices,
           storage: this.storage,
           cloud: deps.cloud,
-          authz: fleetStart.authz,
+          authz: await fleetStart.authz,
         };
         const { renderApp, teardownIntegrations } = await import('./applications/integrations');
 
@@ -181,7 +183,7 @@ export class FleetPlugin implements Plugin<FleetSetup, FleetStart, FleetSetupDep
           ...startDepsServices,
           storage: this.storage,
           cloud: deps.cloud,
-          authz: fleetStart.authz,
+          authz: await fleetStart.authz,
         };
         const { renderApp, teardownFleet } = await import('./applications/fleet');
         const unmount = renderApp(startServices, params, config, kibanaVersion, extensions);
@@ -237,8 +239,10 @@ export class FleetPlugin implements Plugin<FleetSetup, FleetStart, FleetSetupDep
   }
 
   public start(core: CoreStart): FleetStart {
-    let successPromise: ReturnType<FleetStart['isInitialized']>;
     const registerExtension = createExtensionRegistrationCallback(this.extensions);
+    const getPermissions = once(() =>
+      core.http.get<CheckPermissionsResponse>(appRoutesService.getCheckPermissionsPath())
+    );
 
     registerExtension({
       package: CUSTOM_LOGS_INTEGRATION_NAME,
@@ -246,46 +250,49 @@ export class FleetPlugin implements Plugin<FleetSetup, FleetStart, FleetSetupDep
       Component: LazyCustomLogsAssetsExtension,
     });
 
-    const { capabilities } = core.application;
-    const authz = calculateAuthz({
-      fleet: {
-        // Once we have a split privilege, this should be using fleetv2
-        // all: capabilities.fleetv2.all as boolean,
-        all: capabilities.fleet.all as boolean,
-        setup: false, // browser users will never have setup privileges
-      },
+    return {
+      // Temporarily rely on superuser check to calculate authz. Once Kibana RBAC is in place for Fleet this should
+      // switch to a sync calculation based on `core.application.capabilites` properties.
+      authz: getPermissions()
+        .catch((e) => {
+          // eslint-disable-next-line no-console
+          console.warn(`Could not load Fleet permissions due to error: ${e}`);
+          return { success: false };
+        })
+        .then((permissionsResponse) => {
+          if (permissionsResponse.success) {
+            // If superuser, give access to everything
+            return calculateAuthz({
+              fleet: { all: true, setup: true },
+              integrations: { all: true, read: true },
+            });
+          } else {
+            // All other users only get access to read integrations if they have the read privilege
+            const { capabilities } = core.application;
+            return calculateAuthz({
+              fleet: { all: false, setup: false },
+              integrations: { all: false, read: capabilities.fleet.read as boolean },
+            });
+          }
+        }),
 
-      integrations: {
-        all: capabilities.fleet.all as boolean,
-        read: capabilities.fleet.read as boolean,
-      },
-    });
+      isInitialized: once(async () => {
+        const permissionsResponse = await getPermissions();
 
-    return {
-      authz,
-      isInitialized: () => {
-        if (!successPromise) {
-          successPromise = Promise.resolve().then(async () => {
-            const permissionsResponse = await core.http.get<CheckPermissionsResponse>(
-              appRoutesService.getCheckPermissionsPath()
-            );
-
-            if (permissionsResponse?.success) {
-              return core.http
-                .post<PostFleetSetupResponse>(setupRouteService.getSetupPath())
-                .then(({ isInitialized }) =>
-                  isInitialized
-                    ? Promise.resolve(true)
-                    : Promise.reject(new Error('Unknown setup error'))
-                );
-            } else {
-              throw new Error(permissionsResponse?.error || 'Unknown permissions error');
-            }
-          });
+        if (permissionsResponse?.success) {
+          const { isInitialized } = await core.http.post<PostFleetSetupResponse>(
+            setupRouteService.getSetupPath()
+          );
+          if (!isInitialized) {
+            throw new Error('Unknown setup error');
+          }
+
+          return true;
+        } else {
+          throw new Error(permissionsResponse?.error || 'Unknown permissions error');
         }
+      }),
 
-        return successPromise;
-      },
       registerExtension,
     };
   }
diff --git a/x-pack/plugins/fleet/server/routes/security.ts b/x-pack/plugins/fleet/server/routes/security.ts
index 8e037c25ceca9..9853877dc2d61 100644
--- a/x-pack/plugins/fleet/server/routes/security.ts
+++ b/x-pack/plugins/fleet/server/routes/security.ts
@@ -127,41 +127,39 @@ export async function getAuthzFromRequest(req: KibanaRequest): Promise<FleetAuth
   const security = appContextService.getSecurity();
 
   if (security.authz.mode.useRbacForRequest(req)) {
-    const checkPrivileges = security.authz.checkPrivilegesDynamicallyWithRequest(req);
-    const { privileges } = await checkPrivileges({
-      kibana: [
-        security.authz.actions.api.get('fleet-all'),
-        security.authz.actions.api.get('fleet-setup'),
-        security.authz.actions.api.get('integrations-all'),
-        security.authz.actions.api.get('integrations-read'),
-      ],
-    });
-
-    const [fleetAll, fleetSetup, intAll, intRead] = privileges.kibana;
-
-    return calculateAuthz({
-      fleet: {
-        all: fleetAll.authorized,
-        setup: fleetSetup.authorized,
-      },
-
-      integrations: {
-        all: intAll.authorized,
-        read: intRead.authorized,
-      },
-    });
+    if (checkSuperuser(req)) {
+      // Superusers get access to everything
+      // Once we implement Kibana RBAC, remove this and use `checkPrivileges` exclusively
+      return calculateAuthz({
+        fleet: { all: true, setup: true },
+        integrations: { all: true, read: true },
+      });
+    } else if (await checkFleetSetupPrivilege(req)) {
+      // fleet-setup privilege only gets access to setup actions
+      return calculateAuthz({
+        fleet: { all: false, setup: true },
+        integrations: { all: false, read: false },
+      });
+    } else {
+      // All other users only get access to read integrations if they have the read privilege
+      const checkPrivileges = security.authz.checkPrivilegesDynamicallyWithRequest(req);
+      const { privileges } = await checkPrivileges({
+        kibana: [security.authz.actions.api.get('integrations-read')],
+      });
+
+      const [intRead] = privileges.kibana;
+
+      // Once we implement Kibana RBAC, use `checkPrivileges` for all privileges instead of only integrations.read
+      return calculateAuthz({
+        fleet: { all: true, setup: true },
+        integrations: { all: true, read: intRead.authorized },
+      });
+    }
   }
 
   return calculateAuthz({
-    fleet: {
-      all: true,
-      setup: true,
-    },
-
-    integrations: {
-      all: true,
-      read: true,
-    },
+    fleet: { all: false, setup: false },
+    integrations: { all: false, read: false },
   });
 }