diff --git a/packages/craftcms-cp/src/utilities/api/actionClient.ts b/packages/craftcms-cp/src/utilities/api/actionClient.ts
index 4969ff9b1a4..6cac50742ce 100644
--- a/packages/craftcms-cp/src/utilities/api/actionClient.ts
+++ b/packages/craftcms-cp/src/utilities/api/actionClient.ts
@@ -1,11 +1,13 @@
 import axios, {type RawAxiosRequestHeaders} from 'axios';
 import {Csrf} from '@src/services/Csrf';
+import {ConfigService} from '@src/services/Config';
 
 /**
- * @TODO
+ * Builds an action URL using the runtime-configured action base
+ * (`Url::actionUrl()`), so the CP trigger isn't hard-coded to `/admin`.
  */
 export function getActionUrl(action: string = '') {
-  return `/admin/actions/${action}`;
+  return ConfigService.getInstance().getActionUrl(action);
 }
 
 /**
@@ -27,13 +29,15 @@ export function actionHeaders(): RawAxiosRequestHeaders {
   return headers;
 }
 
-export const actionClient = axios.create({
-  baseURL: getActionUrl(),
-});
+export const actionClient = axios.create();
 
 const csrf = new Csrf();
 
 actionClient.interceptors.request.use(async (config) => {
+  // Resolve the base URL lazily so it reflects the runtime CP trigger. Config
+  // isn't guaranteed to be initialized when this module is first imported.
+  config.baseURL = getActionUrl();
+
   // Set X-Requested-With header
   config.headers.set('X-Requested-With', 'XMLHttpRequest');
 
diff --git a/resources/js/bootstrap/cp.ts b/resources/js/bootstrap/cp.ts
index 60275f799cb..5fb8c5e0188 100644
--- a/resources/js/bootstrap/cp.ts
+++ b/resources/js/bootstrap/cp.ts
@@ -15,6 +15,7 @@ import AssetIndexes from '@/modules/utilities/components/asset-indexes/AssetInde
 import SystemMessages from '@/modules/utilities/components/system-messages/SystemMessages.vue';
 import DeprecationErrorsToolbar from '@/modules/utilities/components/deprecation-errors/DeprecationErrorsToolbar.vue';
 import {setTranslations} from '@craftcms/cp/utilities/translate.ts.mjs';
+import {setCpTrigger} from '@/wayfinder/cp-trigger';
 
 let bootedCallbacks: Array<(instance: any) => void> = [];
 let bootingCallbacks: Array<(instance: any) => void> = [];
@@ -53,6 +54,9 @@ const Cp = {
 
   init() {
     config.initialize(this.initialConfig);
+
+    // Make Wayfinder-generated route URLs use the runtime-configured CP trigger.
+    setCpTrigger(config.get('cpTrigger'));
     queue.initialize({
       runAutomatically: config.get('runQueueAutomatically', true),
       enabled: true,
diff --git a/resources/js/modules/install/components/InstallingScreen.vue b/resources/js/modules/install/components/InstallingScreen.vue
index 694a04bf818..39e2968e6eb 100644
--- a/resources/js/modules/install/components/InstallingScreen.vue
+++ b/resources/js/modules/install/components/InstallingScreen.vue
@@ -4,8 +4,10 @@
   import {usePost} from '@/common/composables/useFetch';
   import {usePage} from '@inertiajs/vue3';
   import Pane from '@/common/components/Pane.vue';
+  import useCraftData from '@/common/composables/useCraftData';
 
   const {props: pageProps} = usePage();
+  const {general} = useCraftData();
 
   const props = defineProps<{
     data: any;
@@ -17,7 +19,7 @@
     isSuccess,
     isLoading,
     isError,
-  } = usePost('/admin/actions/install/install', {
+  } = usePost(`/${general.cpTrigger}/actions/install/install`, {
     onSuccess: () => {
       setTimeout(() => {
         window.location.href = pageProps.postCpLoginRedirect as string;
diff --git a/resources/js/modules/updater/composables/useUpdater.ts b/resources/js/modules/updater/composables/useUpdater.ts
index 9b4416d2ddd..1f96bef67d3 100644
--- a/resources/js/modules/updater/composables/useUpdater.ts
+++ b/resources/js/modules/updater/composables/useUpdater.ts
@@ -1,6 +1,7 @@
 import {computed, type ComputedRef, type Ref, ref} from 'vue';
 import {t} from '@craftcms/cp';
 import axios from 'axios';
+import useCraftData from '@/common/composables/useCraftData';
 
 /**
  * State returned from updater API endpoints
@@ -47,6 +48,7 @@ export function useUpdater(
   actionPrefix: string,
   initialState: UpdaterState
 ): UseUpdaterReturn {
+  const {general} = useCraftData();
   const state = ref<UpdaterState>({...initialState});
   const isLoading = ref(false);
 
@@ -62,7 +64,7 @@ export function useUpdater(
 
     try {
       response = await axios.post(
-        `/admin/actions/${actionPrefix}/${action}`,
+        `/${general.cpTrigger}/actions/${actionPrefix}/${action}`,
         {data: state.value.data},
         {
           headers: {
@@ -157,7 +159,7 @@ export function useUpdater(
     // Try to disable maintenance mode
     axios
       .post(
-        `/admin/actions/${actionPrefix}/finish`,
+        `/${general.cpTrigger}/actions/${actionPrefix}/finish`,
         {data: state.value.data},
         {
           headers: {
diff --git a/resources/js/pages/updater/Index.vue b/resources/js/pages/updater/Index.vue
index dd7af27374f..b686749f448 100644
--- a/resources/js/pages/updater/Index.vue
+++ b/resources/js/pages/updater/Index.vue
@@ -7,6 +7,9 @@
     type UpdaterState,
     useUpdater,
   } from '@/modules/updater/composables/useUpdater';
+  import useCraftData from '@/common/composables/useCraftData';
+
+  const {general} = useCraftData();
 
   const props = defineProps<{
     title: string;
@@ -41,7 +44,9 @@
   function handleFinish(): void {
     setTimeout(() => {
       window.location.href =
-        state.value.returnUrl || props.returnUrl || '/admin/dashboard';
+        state.value.returnUrl ||
+        props.returnUrl ||
+        `/${general.cpTrigger}/dashboard`;
     }, 750);
   }
 
diff --git a/scripts/wayfinder-cp-trigger.mjs b/scripts/wayfinder-cp-trigger.mjs
new file mode 100644
index 00000000000..070a2bad43f
--- /dev/null
+++ b/scripts/wayfinder-cp-trigger.mjs
@@ -0,0 +1,58 @@
+#!/usr/bin/env node
+/**
+ * Rewrites Wayfinder-generated route modules so their URLs respect the
+ * runtime-configured CP trigger (`Cms::config()->cpTrigger`) instead of the
+ * `/admin` prefix baked in at generation time.
+ *
+ * Every generated `*.url()` body ends in `+ queryParams(options)` (and `return`
+ * appears nowhere else in generated files), so the base path can be reliably
+ * wrapped in `cpUrl(...)` from `resources/js/wayfinder/cp-trigger.ts`.
+ *
+ * This runs as a Vite `transform` hook (see `vite.config.js`) rather than a
+ * post-generation file rewrite: the `@laravel/vite-plugin-wayfinder` plugin
+ * regenerates these files on the fly, which would clobber any on-disk edits.
+ * Transforming at import time keeps the generated files pristine while still
+ * applying to both dev and production builds.
+ */
+
+/**
+ * Wraps a generated route module's URL bases in `cpUrl(...)` and injects the
+ * import. Returns the transformed source, or `null` when nothing applies (no
+ * URL builders, or already transformed).
+ *
+ * @param {string} code
+ * @returns {string | null}
+ */
+export function transformWayfinderSource(code) {
+  // Nothing to wrap, or already processed.
+  if (!code.includes(' + queryParams(options)') || code.includes('cpUrl(')) {
+    return null;
+  }
+
+  // Wrap each url() base path (everything between `return ` and the trailing
+  // `+ queryParams(options)`) in cpUrl().
+  const wrapped = code.replace(
+    /return ([\s\S]*?) \+ queryParams\(options\)/g,
+    'return cpUrl($1) + queryParams(options)'
+  );
+
+  if (wrapped === code) {
+    return null;
+  }
+
+  // Add the cpUrl import as a sibling of the existing wayfinder import, reusing
+  // its (depth-specific) relative module specifier.
+  return wrapped.replace(
+    /^(import .*from '(.*\/wayfinder)')$/m,
+    "$1\nimport { cpUrl } from '$2/cp-trigger'"
+  );
+}
+
+/** True for Wayfinder-generated route module ids that should be transformed. */
+export function isWayfinderRouteModule(id) {
+  const normalized = id.split('?')[0].replace(/\\/g, '/');
+  return (
+    /\/resources\/js\/(actions|routes)\//.test(normalized) &&
+    normalized.endsWith('.ts')
+  );
+}
diff --git a/vite.config.js b/vite.config.js
index 81e593ac318..142deaeefd9 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -8,9 +8,34 @@ import {promisify} from 'util';
 import vue from '@vitejs/plugin-vue';
 import tailwindcss from '@tailwindcss/vite';
 import {wayfinder} from '@laravel/vite-plugin-wayfinder';
+import {
+  transformWayfinderSource,
+  isWayfinderRouteModule,
+} from './scripts/wayfinder-cp-trigger.mjs';
 
 const execAsync = promisify(exec);
 
+/**
+ * Rewrites Wayfinder-generated route URLs to use the runtime CP trigger instead
+ * of the `/admin` prefix baked in at generation time. Runs at import time so it
+ * survives the wayfinder() plugin regenerating the files on disk.
+ */
+function wayfinderCpTrigger() {
+  return {
+    name: 'wayfinder-cp-trigger',
+    enforce: 'pre',
+    transform(code, id) {
+      if (!isWayfinderRouteModule(id)) {
+        return null;
+      }
+
+      const transformed = transformWayfinderSource(code);
+
+      return transformed ? {code: transformed, map: null} : null;
+    },
+  };
+}
+
 const MIME_TYPES = {
   '.js': 'application/javascript',
   '.mjs': 'application/javascript',
@@ -151,6 +176,7 @@ export default defineConfig(({mode}) => {
         path: 'resources/js',
         command: './vendor/bin/testbench wayfinder:generate',
       }),
+      wayfinderCpTrigger(),
       vue({
         template: {
           compilerOptions: {