diff --git a/application/views/templates/CISVUE-Header.php b/application/views/templates/CISVUE-Header.php
index 43716b3b5..ca62402f2 100644
--- a/application/views/templates/CISVUE-Header.php
+++ b/application/views/templates/CISVUE-Header.php
@@ -29,14 +29,18 @@ $this->load->view('templates/FHC-Header', $includesArray);
 		document.body.classList.add("in-frame");
 </script>
 
-<header id="cis-header" class="navbar-dark">
-	<cis-menu 
-		root-url="<?= site_url(''); ?>" 
-		logo-url="<?= base_url($this->config->item('theme_logo')); ?>" 
-		avatar-url="<?= site_url('Cis/Pub/bild/person/' . getAuthPersonId()); ?>" 
+<!-- used by cis4 native pages, teleported menu needs data attributes-->
+<header id="cis-header" class="navbar-dark"
+	data-root-url="<?= site_url(''); ?>"
+	data-logo-url="<?= base_url($this->config->item('theme_logo')); ?>"
+	data-avatar-url="<?= site_url('Cis/Pub/bild/person/' . getAuthPersonId()); ?>"
+	data-logout-url="<?= site_url('Cis/Auth/logout'); ?>">
+<!-- used by legacy cis pages & content pages which use component props -->
+	<cis-menu
+		root-url="<?= site_url(''); ?>"
+		logo-url="<?= base_url($this->config->item('theme_logo')); ?>"
+		avatar-url="<?= site_url('Cis/Pub/bild/person/' . getAuthPersonId()); ?>"
 		logout-url="<?= site_url('Cis/Auth/logout'); ?>"
-		:searchbaroptions="searchbaroptions" 
-		:searchfunction="searchfunction"
 		></cis-menu>
 </header>
 
diff --git a/public/js/apps/Cis/Cis.js b/public/js/apps/Cis/Cis.js
index 56635157c..90c5a8c0e 100644
--- a/public/js/apps/Cis/Cis.js
+++ b/public/js/apps/Cis/Cis.js
@@ -8,9 +8,19 @@ import {capitalize} from "../../helpers/StringHelpers.js";
 import ApiAuthinfo from "../../api/factory/authinfo.js";
 
 import {router} from "../../routers/Cis/CisRouter.js";
+import CisMenu from "../../components/Cis/Menu.js";
 
 const app = Vue.createApp({
 	name: 'CisApp',
+	components: {
+		CisMenu,
+	},
+	template: `
+		<Teleport to="#cis-header">
+			<CisMenu />
+		</Teleport>
+		<router-view />
+	`,
 	data: () => ({
 		appSideMenuEntries: {},
 		windowWidth: 0,
@@ -18,12 +28,13 @@ const app = Vue.createApp({
 		isMitarbeiter: null,
 	}),
 	provide() {
-		return { // provide injectable & watchable language property
+		return {
 			language: Vue.computed(() => this.$p.user_language),
+			isNarrow: Vue.computed(() => this.windowWidth < 992),
 			isMobile: Vue.computed(() => this.isMobile),
 			isStudent: Vue.computed(() => this.isStudent),
 			isMitarbeiter: Vue.computed(() => this.isMitarbeiter)
-		}	
+		}
 	},
 	computed: {
 		isMobile: function() {
@@ -103,6 +114,9 @@ app.directive('tooltip', primevue.tooltip);
 app.use(PluginsPhrasen);
 app.use(Theme);
 app.directive('contrast', contrast);
+
+// Clear the Teleport target before mounting (removes the static <cis-menu> tag from PHP)
+document.getElementById('cis-header').innerHTML = '';
 app.mount('#fhccontent');
 
 router.afterEach((to, from, failure) => {
diff --git a/public/js/apps/Cis/Menu.js b/public/js/apps/Cis/Menu.js
index 8897b7b84..55c82b48a 100644
--- a/public/js/apps/Cis/Menu.js
+++ b/public/js/apps/Cis/Menu.js
@@ -1,191 +1,30 @@
-import FhcSearchbar from "../../components/searchbar/searchbar.js";
 import CisMenu from "../../components/Cis/Menu.js";
 import PluginsPhrasen from '../../plugins/Phrasen.js';
 import Theme from "../../plugins/Theme.js";
-import ApiSearchbar from '../../api/factory/searchbar.js';
-import ApiLvPlan from "../../api/factory/lvPlan.js";
-
-import {router} from "../../routers/Cis/CisRouter.js";
 
 const app = Vue.createApp({
-    name: 'CisMenuApp',
-    components: {
-        FhcSearchbar,
-        CisMenu
-    },
-    data: function() {
-        return {
-            searchbaroptions: {
-				origin: "cis",
-				cssclass: "",
-				calcheightonly: true,
-				types: {
-					employee: Vue.computed(() => this.$p.t("search/type_employee")),
-					student: Vue.computed(() => this.$p.t("search/type_student")),
-					room: Vue.computed(() => this.$p.t("search/type_room")),
-					organisationunit: Vue.computed(() => this.$p.t("search/type_organisationunit")),
-					cms: Vue.computed(() => this.$p.t("search/type_cms")),
-					dms: Vue.computed(() => this.$p.t("search/type_dms"))
-				},
-                actions: {
-                    employee: {
-                        defaultaction: {
-                            type: "link",
-                            action: function(data) {
-									return FHC_JS_DATA_STORAGE_OBJECT.app_root + FHC_JS_DATA_STORAGE_OBJECT.ci_router+
-										"/Cis/Profil/View/"+data.uid;
-							}
-						},
-                        childactions: []
-					},
-					student: {
-						defaultaction: {
-							type: "link",
-							action: function (data) {
-								return FHC_JS_DATA_STORAGE_OBJECT.app_root + FHC_JS_DATA_STORAGE_OBJECT.ci_router +
-									"/Cis/Profil/View/" + data.uid;
-
-							}
-						},
-						childactions: []
-					},
-                    room: {
-                        defaultaction: {
-                            type: "link",
-							renderif: function(data) {
-								if(data.content_id === null){
-									return false;
-								}
-								return true;
-							},
-                            action: function(data) { 
-								const link= FHC_JS_DATA_STORAGE_OBJECT.app_root +
-									FHC_JS_DATA_STORAGE_OBJECT.ci_router +
-									'/CisVue/Cms/content/' + data.content_id;
-								return link;
-                            }
-                        },
-                        childactions: [
-                            {
-                                label: "LV-Plan",
-                                icon: "fas fa-bookmark",
-                                type: "link",
-                                action: function(data) {
-									const link = FHC_JS_DATA_STORAGE_OBJECT.app_root +
-										FHC_JS_DATA_STORAGE_OBJECT.ci_router +
-										'/CisVue/Cms/getRoomInformation/' + data.ort_kurzbz;
-									return link;
-                                }
-                            },
-                            {
-                                label: "Rauminformation",
-                                icon: "fas fa-info-circle",
-                                type: "link",
-                                renderif: function(data) {
-									if(data.content_id === null){
-										return false;
-									}
-									return true;
-                                },
-                                action: function(data) {
-									const link= FHC_JS_DATA_STORAGE_OBJECT.app_root +
-										FHC_JS_DATA_STORAGE_OBJECT.ci_router +
-										'/CisVue/Cms/content/' + data.content_id;
-									return link;
-                                }
-                            },
-                        ]
-                    },
-                    organisationunit: {
-                        defaultaction: {
-                            type: "link",
-							renderif: function(data) {
-								if(data.mailgroup) {
-									return true;
-								}
-								return false;
-							},
-                            action: function(data) {
-                                const link = 'mailto:' + data.mailgroup;
-								return link;
-                            }
-                        },
-                        childactions: []
-                    },
-					cms: {
-						defaultaction: {
-							type: "link",
-							action: function (data) {
-								const link = FHC_JS_DATA_STORAGE_OBJECT.app_root +
-									FHC_JS_DATA_STORAGE_OBJECT.ci_router +
-									'/CisVue/Cms/content/' + data.content_id;
-								return link;
-							}
-						},
-						childactions: []
-					},
-					dms: {
-						defaultaction: {
-							type: "link",
-							action: function (data) {
-								const link = FHC_JS_DATA_STORAGE_OBJECT.app_root +
-									'cms/dms.php?id=' + data.dms_id;
-								return link;
-							}
-						},
-						childactions: []
-					}
-                }
-            },
-			windowWidth: 0,
-        };
-    },
+	name: 'CisMenuApp',
+	components: {
+		CisMenu,
+	},
+	data: () => ({
+		windowWidth: 0,
+	}),
 	provide() {
 		return {
 			isNarrow: Vue.computed(() => this.windowWidth < 992),
 			isMobile: Vue.computed(() => this.windowWidth < 767),
 		}
 	},
-    methods: {
-        searchfunction: function(searchsettings) {
-        	return this.$api.call(ApiSearchbar.searchCis(searchsettings));
-        },
+	methods: {
 		handleWindowResize() {
 			this.windowWidth = window.innerWidth;
 		},
-    },
+	},
 	created() {
 		this.windowWidth = window.innerWidth;
 	},
-	async mounted() {
-		const openOtherLvPlanAction = {
-			label: Vue.computed(() => this.$p.t("lehre/stundenplan")),
-			icon: "fas fa-calendar-days",
-			type: "link",
-			action: function (data) {
-				const uid = JSON.parse(data.data).uid;
-				const link =
-					FHC_JS_DATA_STORAGE_OBJECT.app_root +
-					FHC_JS_DATA_STORAGE_OBJECT.ci_router +
-					"/Cis/OtherLvPlan/" +
-					uid;
-				return link;
-			},
-		};
-		let checkPermissionOtherLvPlanResult = await this.$api.call(
-			ApiLvPlan.checkPermissionOtherLvPlan(),
-		);
-		if (
-			checkPermissionOtherLvPlanResult.meta.status === "success" &&
-			checkPermissionOtherLvPlanResult.data
-		) {
-			this.searchbaroptions.actions.employee.childactions.push(
-				openOtherLvPlanAction,
-			);
-			this.searchbaroptions.actions.student.childactions.push(
-				openOtherLvPlanAction,
-			);
-		}
+	mounted() {
 		window.addEventListener("resize", this.handleWindowResize);
 	},
 	beforeUnmount() {
@@ -195,7 +34,6 @@ const app = Vue.createApp({
 
 FhcApps.makeExtendable(app);
 
-app.use(router);
 app.use(primevue.config.default, {
 	zIndex: {
 		overlay: 9000,
@@ -204,4 +42,9 @@ app.use(primevue.config.default, {
 })
 app.use(PluginsPhrasen);
 app.use(Theme);
-app.mount('#cis-header');
+
+// On native CIS4 pages, CisApp handles the menu via Teleport.
+// Menu.js only mounts on legacy pages that have no CisApp.
+if (!document.getElementById('fhccontent')) {
+	app.mount('#cis-header');
+}
diff --git a/public/js/components/Cis/Menu.js b/public/js/components/Cis/Menu.js
index e3cd8625a..3eb18b8ca 100644
--- a/public/js/components/Cis/Menu.js
+++ b/public/js/components/Cis/Menu.js
@@ -3,6 +3,8 @@ import FhcSearchbar from "../searchbar/searchbar.js";
 import CisSprachen from "./Sprachen.js"
 import ThemeSwitch from "./ThemeSwitch.js";
 import ApiCisMenu from '../../api/factory/cis/menu.js';
+import ApiSearchbar from '../../api/factory/searchbar.js';
+import ApiLvPlan from "../../api/factory/lvPlan.js";
 
 export default {
     components: {
@@ -12,15 +14,24 @@ export default {
 		ThemeSwitch,
     },
     props: {
-		rootUrl: String,
-        logoUrl: String,
-        avatarUrl: String,
-        logoutUrl: String,
-		selectedtypes: Array,
-        searchbaroptions: Object,
-        searchfunction: Function
+		rootUrl: {
+			type: String,
+			default: () => document.getElementById('cis-header')?.dataset.rootUrl ?? ''
+		},
+		logoUrl: {
+			type: String,
+			default: () => document.getElementById('cis-header')?.dataset.logoUrl ?? ''
+		},
+		avatarUrl: {
+			type: String,
+			default: () => document.getElementById('cis-header')?.dataset.avatarUrl ?? ''
+		},
+		logoutUrl: {
+			type: String,
+			default: () => document.getElementById('cis-header')?.dataset.logoutUrl ?? ''
+		},
     },
-    data: () => {
+    data: function() {
         return {
             entries: [],
 			activeEntry:null,
@@ -28,6 +39,112 @@ export default {
 			urlMatchRankings:[],
 			navUserDropdown:null,
 			menuOpen:true,
+			searchbaroptions: {
+				origin: "cis",
+				cssclass: "",
+				calcheightonly: true,
+				types: {
+					employee: Vue.computed(() => this.$p.t("search/type_employee")),
+					student: Vue.computed(() => this.$p.t("search/type_student")),
+					room: Vue.computed(() => this.$p.t("search/type_room")),
+					organisationunit: Vue.computed(() => this.$p.t("search/type_organisationunit")),
+					cms: Vue.computed(() => this.$p.t("search/type_cms")),
+					dms: Vue.computed(() => this.$p.t("search/type_dms"))
+				},
+				actions: {
+					employee: {
+						defaultaction: {
+							type: "link",
+							action: function(data) {
+								return FHC_JS_DATA_STORAGE_OBJECT.app_root + FHC_JS_DATA_STORAGE_OBJECT.ci_router +
+									"/Cis/Profil/View/" + data.uid;
+							}
+						},
+						childactions: []
+					},
+					student: {
+						defaultaction: {
+							type: "link",
+							action: function(data) {
+								return FHC_JS_DATA_STORAGE_OBJECT.app_root + FHC_JS_DATA_STORAGE_OBJECT.ci_router +
+									"/Cis/Profil/View/" + data.uid;
+							}
+						},
+						childactions: []
+					},
+					room: {
+						defaultaction: {
+							type: "link",
+							renderif: function(data) {
+								return data.content_id !== null;
+							},
+							action: function(data) {
+								return FHC_JS_DATA_STORAGE_OBJECT.app_root +
+									FHC_JS_DATA_STORAGE_OBJECT.ci_router +
+									'/CisVue/Cms/content/' + data.content_id;
+							}
+						},
+						childactions: [
+							{
+								label: "LV-Plan",
+								icon: "fas fa-bookmark",
+								type: "link",
+								action: function(data) {
+									return FHC_JS_DATA_STORAGE_OBJECT.app_root +
+										FHC_JS_DATA_STORAGE_OBJECT.ci_router +
+										'/CisVue/Cms/getRoomInformation/' + data.ort_kurzbz;
+								}
+							},
+							{
+								label: "Rauminformation",
+								icon: "fas fa-info-circle",
+								type: "link",
+								renderif: function(data) {
+									return data.content_id !== null;
+								},
+								action: function(data) {
+									return FHC_JS_DATA_STORAGE_OBJECT.app_root +
+										FHC_JS_DATA_STORAGE_OBJECT.ci_router +
+										'/CisVue/Cms/content/' + data.content_id;
+								}
+							},
+						]
+					},
+					organisationunit: {
+						defaultaction: {
+							type: "link",
+							renderif: function(data) {
+								return !!data.mailgroup;
+							},
+							action: function(data) {
+								return 'mailto:' + data.mailgroup;
+							}
+						},
+						childactions: []
+					},
+					cms: {
+						defaultaction: {
+							type: "link",
+							action: function(data) {
+								return FHC_JS_DATA_STORAGE_OBJECT.app_root +
+									FHC_JS_DATA_STORAGE_OBJECT.ci_router +
+									'/CisVue/Cms/content/' + data.content_id;
+							}
+						},
+						childactions: []
+					},
+					dms: {
+						defaultaction: {
+							type: "link",
+							action: function(data) {
+								return FHC_JS_DATA_STORAGE_OBJECT.app_root +
+									'cms/dms.php?id=' + data.dms_id;
+							}
+						},
+						childactions: []
+					}
+				}
+			},
         };
     },
 	inject: ["isNarrow", "isMobile"],
@@ -102,15 +219,35 @@ export default {
 		setActiveEntry(content_id){
 			this.activeEntry = content_id;
 		},
+		searchfunction(searchsettings) {
+			return this.$api.call(ApiSearchbar.searchCis(searchsettings));
+		},
 	},
 	created(){
 		this.fetchMenu();
 	},
-	mounted(){
+	async mounted(){
 		this.$p.loadCategory(['ui', 'global', 'profilUpdate'])
 		this.navUserDropdown = new bootstrap.Collapse(this.$refs.navUserDropdown,{
 			toggle: false
 		});
+
+		const openOtherLvPlanAction = {
+			label: Vue.computed(() => this.$p.t("lehre/stundenplan")),
+			icon: "fas fa-calendar-days",
+			type: "link",
+			action: function(data) {
+				const uid = JSON.parse(data.data).uid;
+				return FHC_JS_DATA_STORAGE_OBJECT.app_root +
+					FHC_JS_DATA_STORAGE_OBJECT.ci_router +
+					"/Cis/OtherLvPlan/" + uid;
+			},
+		};
+		let result = await this.$api.call(ApiLvPlan.checkPermissionOtherLvPlan());
+		if (result.meta.status === "success" && result.data) {
+			this.searchbaroptions.actions.employee.childactions.push(openOtherLvPlanAction);
+			this.searchbaroptions.actions.student.childactions.push(openOtherLvPlanAction);
+		}
 	},
     template: /*html*/`
 	<div id="cis-header-bar" class="d-flex flex-row flex-grow-1">
diff --git a/public/js/components/Cis/Menu/Entry.js b/public/js/components/Cis/Menu/Entry.js
index dda25ffd8..fca777c1a 100644
--- a/public/js/components/Cis/Menu/Entry.js
+++ b/public/js/components/Cis/Menu/Entry.js
@@ -151,7 +151,7 @@ export default {
         toggleCollapse(evt) {
 			if (this.active)
 			{
-				this.makeParentContentActive(this.entry.content_id); 
+				this.makeParentContentActive(this.entry.content_id);
 			}
 			else
 			{
@@ -176,7 +176,7 @@ export default {
         <template v-if="hasChilds">
 			<div class="btn-group w-100">
  				<cis-menu-link :target="target"
- 					:href="(entry.menu_open && hasFullLink) ? entry.url : null"
+ 					:href="hasFullLink ? entry.url : null"
 					@click="toggleCollapse"
                     :class="{
                         'btn btn-default rounded-0 text-start': true,
diff --git a/public/js/components/Cis/Menu/Link.js b/public/js/components/Cis/Menu/Link.js
index 8255cbf55..6fde228a8 100644
--- a/public/js/components/Cis/Menu/Link.js
+++ b/public/js/components/Cis/Menu/Link.js
@@ -1,5 +1,3 @@
-import {isCompatLink, calcCompatRouterLink} from '../../../helpers/CompatLinkHelpers.js';
-
 export default {
 	name: 'CisMenuLink',
 	props: {
@@ -8,31 +6,45 @@ export default {
 			default: null
 		}
 	},
-	methods: {
-		isRouterHandled() {
-			let isrouterhandled = this.$route.matched.length > 0;
-			return isrouterhandled;
-		},
-		isCompatLink() {
-			if(this.href === null) {
-				return false;
+	computed: {
+		// Generaliserung von isRouterLink() aus CompatLinkHelpers.js:
+		// prüft ALLE bekannten Routen, nicht nur Compat-URLs.
+		resolvedRoute() {
+			// Legacy-Seiten haben keinen Router (Menu.js mountet ohne)
+			if (!this.href || !this.$router) return null;
+
+			let path = this.href;
+
+			// Menu-API liefert absolute URLs —> Pfad extrahieren, externe Links ignorieren
+			if (path.startsWith('http')) {
+				try {
+					const url = new URL(path);
+					if (url.origin !== window.location.origin) return null;
+					path = url.pathname + url.search;
+				} catch {
+					return null;
+				}
 			}
-			return isCompatLink(this.href);
-		},
-		calcCompatRouterLink() {
-			return calcCompatRouterLink(this.href);
+
+			// Nur Pfade unterhalb der Router-Base kommen in Frage
+			const base = this.$router.options.history.base;
+			if (!path.startsWith(base)) return null;
+
+			// Router die Route auflösen lassen
+			const route = path.substring(base.length) || '/';
+			const resolved = this.$router.resolve(route);
+
+			if (!resolved?.matched?.length || resolved.name === 'Fallback') return null;
+
+			return route;
 		}
 	},
 	template: `
-		<router-link v-if="this.isRouterHandled() && this.isCompatLink()"
-			:to="this.calcCompatRouterLink()"
-		>
+		<router-link v-if="resolvedRoute !== null" :to="resolvedRoute">
 			<slot></slot>
 		</router-link>
-		<a v-else 
-			:href="this.href"
-		>
+		<a v-else :href="href">
 			<slot></slot>
 		</a>
 	`
-};
\ No newline at end of file
+};