diff --git a/src/App.vue b/src/App.vue
index efe6df4112..5ba4789edc 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -37,6 +37,7 @@ import LeftSidebar from './components/LeftSidebar/LeftSidebar.vue'
 import RightSidebar from './components/RightSidebar/RightSidebar.vue'
 import DefaultPageError from './views/DefaultPageError.vue'
 
+import { initialActionCode, ACTION_CODES } from './helpers/ActionMapping'
 import LogoLibreSign from '../img/logo-gray.svg'
 
 const route = useRoute()
@@ -44,7 +45,7 @@ const loading = ref(false)
 
 const isRoot = computed(() => route.path === '/')
 const isSignExternalPage = computed(() => route.path.startsWith('/p/'))
-const isDoNothingError = computed(() => (route.params?.action as number | undefined) === 2000)
+const isDoNothingError = computed(() => initialActionCode.value === ACTION_CODES.DO_NOTHING)
 const showLeftSidebar = computed(() => !route.matched.some(record => record.meta?.hideLeftSidebar === true))
 </script>
 
diff --git a/src/helpers/ActionMapping.ts b/src/helpers/ActionMapping.ts
index 14e7154da0..5257a04aa2 100644
--- a/src/helpers/ActionMapping.ts
+++ b/src/helpers/ActionMapping.ts
@@ -3,6 +3,8 @@
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
 
+import { ref } from '@vue/reactivity'
+
 interface ActionCodes {
 	REDIRECT: number
 	CREATE_ACCOUNT: number
@@ -53,6 +55,14 @@ export const ACTION_CODE_TO_ROUTE: Readonly<ActionCodeToRoute> = Object.freeze({
 	[ACTION_CODES.INCOMPLETE_SETUP]: 'Incomplete',
 })
 
+/**
+ * Shared reactive ref for the initial action code injected by the server
+ * (#initial-state-libresign-action). Written once by router.ts beforeEach,
+ * read by App.vue. Lives here (not in router.ts) to avoid App.vue triggering
+ * the router module's side effects (createRouter, generateUrl) on import.
+ */
+export const initialActionCode = ref(0)
+
 export const REQUIREMENT_TO_MODAL: Readonly<RequirementToModal> = Object.freeze({
 	identificationDocuments: 'uploadDocuments',
 	emailCode: 'emailToken',
diff --git a/src/router/router.ts b/src/router/router.ts
index 93868bb297..26344bfa7a 100644
--- a/src/router/router.ts
+++ b/src/router/router.ts
@@ -8,6 +8,7 @@ import { createRouter, createWebHistory, type Router, type RouteRecordRaw } from
 import { loadState } from '@nextcloud/initial-state'
 import { getRootUrl, generateUrl } from '@nextcloud/router'
 
+import { initialActionCode } from '../helpers/ActionMapping'
 import { isExternal } from '../helpers/isExternal'
 import { selectAction } from '../helpers/SelectAction'
 
@@ -212,7 +213,7 @@ router.beforeEach((to, from, next) => {
 	let action
 	if (actionElement) {
 		const actionValue = loadState('libresign', 'action', 0)
-		to.params.action = String(actionValue)
+		initialActionCode.value = actionValue
 		action = selectAction(actionValue, to, from)
 		document.querySelector('#initial-state-libresign-action')?.remove()
 	}
diff --git a/src/tests/App.spec.ts b/src/tests/App.spec.ts
index e24df2e259..afa9e28b37 100644
--- a/src/tests/App.spec.ts
+++ b/src/tests/App.spec.ts
@@ -6,6 +6,8 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 import { mount } from '@vue/test-utils'
 
+import { initialActionCode, ACTION_CODES } from '../helpers/ActionMapping'
+
 type RouteState = {
 	path: string
 	name: string | undefined
@@ -56,6 +58,7 @@ describe('App', () => {
 		routeState.name = 'fileslist'
 		routeState.params = {}
 		routeState.matched = []
+		initialActionCode.value = 0
 	})
 
 	it('shows left sidebar on regular internal routes', () => {
@@ -182,8 +185,8 @@ describe('App', () => {
 		expect(wrapper.find('.nc-content').classes()).not.toContain('sign-external-page')
 	})
 
-	it('shows DefaultPageError when action param is 2000', () => {
-		routeState.params = { action: 2000 }
+	it('shows DefaultPageError when initial action code is DO_NOTHING (2000)', () => {
+		initialActionCode.value = ACTION_CODES.DO_NOTHING
 
 		const wrapper = mount(App, {
 			global: {
@@ -203,8 +206,6 @@ describe('App', () => {
 	})
 
 	it('does not show DefaultPageError on normal routes', () => {
-		routeState.params = {}
-
 		const wrapper = mount(App, {
 			global: {
 				stubs: {