diff --git a/frontend/src/views/TasksView.vue b/frontend/src/views/TasksView.vue
index dfd57d2..7c79d34 100644
--- a/frontend/src/views/TasksView.vue
+++ b/frontend/src/views/TasksView.vue
@@ -127,11 +127,20 @@
             <Button label="Teilen" size="small" @click="doShare" />
           </div>
           <div v-if="listShares.length" class="existing-shares">
-            <div v-for="s in listShares" :key="s.id" class="share-perm-item">
-              <i class="pi pi-user"></i> <span>{{ s.username }}</span>
-              <span class="perm-label">{{ s.permission === 'readwrite' ? 'Lesen+Schreiben' : 'Lesen' }}</span>
-              <Button icon="pi pi-trash" text size="small" severity="danger" @click="removeShare(s.id)" />
-            </div>
+            <template v-for="s in listShares" :key="s.id">
+              <div v-if="editingShareId !== s.id" class="share-perm-item">
+                <i class="pi pi-user"></i> <span>{{ s.username }}</span>
+                <span class="perm-label">{{ s.permission === 'readwrite' ? 'Lesen+Schreiben' : 'Lesen' }}</span>
+                <Button icon="pi pi-pencil" text size="small" title="Bearbeiten" @click="startEditShare(s)" />
+                <Button icon="pi pi-trash" text size="small" severity="danger" title="Entfernen" @click="removeShare(s.id)" />
+              </div>
+              <div v-else class="share-perm-item editing">
+                <i class="pi pi-user"></i> <span>{{ s.username }}</span>
+                <Select v-model="editSharePermission" :options="permOptions" optionLabel="label" optionValue="value" />
+                <Button icon="pi pi-check" text size="small" severity="success" title="Speichern" @click="saveEditShare(s)" />
+                <Button icon="pi pi-times" text size="small" title="Abbrechen" @click="editingShareId = null" />
+              </div>
+            </template>
           </div>
         </div>
         <div v-if="menuList.permission === 'owner'" class="field" style="border-top:1px solid var(--p-surface-200); padding-top:1rem">
@@ -248,8 +257,31 @@ const shareUsername = ref('')
 const sharePermission = ref('read')
 const listShares = ref([])
 const shareSearchResults = ref([])
+const editingShareId = ref(null)
+const editSharePermission = ref('read')
 let shareSearchTimer = null
 
+function startEditShare(s) {
+  editingShareId.value = s.id
+  editSharePermission.value = s.permission
+}
+
+async function saveEditShare(s) {
+  if (!menuList.value) return
+  try {
+    await apiClient.post(`/tasklists/${menuList.value.id}/share`, {
+      username: s.username,
+      permission: editSharePermission.value,
+    })
+    editingShareId.value = null
+    await loadShares()
+    toast.add({ severity: 'success', summary: 'Berechtigung aktualisiert', life: 2500 })
+  } catch (err) {
+    toast.add({ severity: 'error', summary: 'Fehler',
+                detail: err.response?.data?.error || err.message, life: 4000 })
+  }
+}
+
 function onShareSearch() {
   clearTimeout(shareSearchTimer)
   const q = shareUsername.value.trim()
@@ -655,7 +687,8 @@ watch(selectedListId, loadTasks)
                display: flex; gap: 0.5rem; align-items: center; }
 .user-result:hover { background: var(--p-primary-50); }
 .existing-shares { margin-top: 0.5rem; }
-.share-perm-item { display: flex; align-items: center; gap: 0.5rem; padding: 0.375rem 0; font-size: 0.875rem; }
+.share-perm-item { display: flex; align-items: center; gap: 0.5rem; padding: 0.375rem 0; font-size: 0.875rem; flex-wrap: wrap; }
+.share-perm-item.editing { background: var(--p-surface-50); padding: 0.5rem; border-radius: 4px; }
 .perm-label { color: var(--p-text-muted-color); font-size: 0.75rem; }
 .url-row { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }
 .url-row strong { min-width: 110px; font-size: 0.8rem; }