diff --git a/frontend/components/Task/TaskDetails.tsx b/frontend/components/Task/TaskDetails.tsx
index e98c40b..9504126 100644
--- a/frontend/components/Task/TaskDetails.tsx
+++ b/frontend/components/Task/TaskDetails.tsx
@@ -43,6 +43,8 @@ const TaskDetails: React.FC = () => {
     const location = useLocation();
     const { t } = useTranslation();
     const isNewTask = location.state?.isNew === true;
+    const isNewTaskRef = useRef(isNewTask);
+    const taskModifiedRef = useRef(false);
     const { showSuccessToast, showErrorToast } = useToast();
 
     // Clear navigation state so refresh/back doesn't re-trigger edit mode
@@ -52,6 +54,22 @@ const TaskDetails: React.FC = () => {
         }
     }, [isNewTask, navigate, location.pathname]);
 
+    // Clean up abandoned new tasks: if user navigates away without modifying anything, delete the task
+    useEffect(() => {
+        const taskUid = uid;
+        return () => {
+            if (isNewTaskRef.current && !taskModifiedRef.current && taskUid) {
+                deleteTask(taskUid).catch((err) =>
+                    console.error('Error cleaning up abandoned new task:', err)
+                );
+                const store = useStore.getState();
+                store.tasksStore.setTasks(
+                    store.tasksStore.tasks.filter((t: Task) => t.uid !== taskUid)
+                );
+            }
+        };
+    }, [uid]);
+
     const projectsStore = useStore((state: any) => state.projectsStore);
     const tagsStore = useStore((state: any) => state.tagsStore);
     const tasksStore = useStore((state: any) => state.tasksStore);
@@ -221,6 +239,7 @@ const TaskDetails: React.FC = () => {
         }
 
         try {
+            taskModifiedRef.current = true;
             const recurrencePayload: Partial<Task> = {
                 recurrence_type: recurrenceForm.recurrence_type,
                 recurrence_interval: recurrenceForm.recurrence_interval || 1,
@@ -336,6 +355,7 @@ const TaskDetails: React.FC = () => {
         }
 
         try {
+            taskModifiedRef.current = true;
             await updateTask(task.uid, {
                 ...task,
                 due_date: editedDueDate || null,
@@ -409,6 +429,7 @@ const TaskDetails: React.FC = () => {
         }
 
         try {
+            taskModifiedRef.current = true;
             await updateTask(task.uid, {
                 defer_until: editedDeferUntil || null,
             });
@@ -636,6 +657,7 @@ const TaskDetails: React.FC = () => {
         }
 
         try {
+            taskModifiedRef.current = true;
             await updateTask(task.uid, { ...task, subtasks: subtasksToSave });
 
             if (uid) {
@@ -666,6 +688,7 @@ const TaskDetails: React.FC = () => {
         if (!task?.uid) return;
 
         try {
+            taskModifiedRef.current = true;
             await updateTask(task.uid, { ...task, project_id: project.id });
 
             if (uid) {
@@ -697,6 +720,7 @@ const TaskDetails: React.FC = () => {
         if (!task?.uid) return;
 
         try {
+            taskModifiedRef.current = true;
             await updateTask(task.uid, { ...task, project_id: null });
 
             if (uid) {
@@ -775,6 +799,7 @@ const TaskDetails: React.FC = () => {
         }
 
         try {
+            taskModifiedRef.current = true;
             const updatedTaskResponse = await toggleTaskCompletion(
                 task.uid,
                 task
@@ -813,6 +838,7 @@ const TaskDetails: React.FC = () => {
         if (!task?.uid) return;
 
         try {
+            taskModifiedRef.current = true;
             await updateTask(task.uid, {
                 ...task,
                 status: newStatus,
@@ -853,6 +879,7 @@ const TaskDetails: React.FC = () => {
     const handleDeleteConfirm = async () => {
         if (taskToDelete?.uid) {
             try {
+                taskModifiedRef.current = true;
                 await deleteTask(taskToDelete.uid);
                 showSuccessToast(
                     t('task.deleteSuccess', 'Task deleted successfully')
@@ -899,6 +926,7 @@ const TaskDetails: React.FC = () => {
         }
 
         try {
+            taskModifiedRef.current = true;
             await updateTask(task.uid, { ...task, name: newTitle.trim() });
 
             if (uid) {
@@ -939,6 +967,7 @@ const TaskDetails: React.FC = () => {
         }
 
         try {
+            taskModifiedRef.current = true;
             await updateTask(task.uid, { ...task, note: trimmedContent });
 
             if (uid) {
@@ -971,6 +1000,7 @@ const TaskDetails: React.FC = () => {
         if (!task?.uid || !name.trim()) return;
 
         try {
+            taskModifiedRef.current = true;
             const newProject = await createProject({ name });
 
             projectsStore.setProjects([...projectsStore.projects, newProject]);
@@ -1017,6 +1047,7 @@ const TaskDetails: React.FC = () => {
         }
 
         try {
+            taskModifiedRef.current = true;
             await updateTask(task.uid, {
                 ...task,
                 tags: tags.map((name) => ({ name })),
@@ -1058,6 +1089,7 @@ const TaskDetails: React.FC = () => {
         if (!task?.uid) return;
 
         try {
+            taskModifiedRef.current = true;
             await updateTask(task.uid, {
                 ...task,
                 priority: priority,