diff --git a/invokeai/frontend/web/src/services/events/onInvocationComplete.test.ts b/invokeai/frontend/web/src/services/events/onInvocationComplete.test.ts
new file mode 100644
index 00000000000..512c6bce203
--- /dev/null
+++ b/invokeai/frontend/web/src/services/events/onInvocationComplete.test.ts
@@ -0,0 +1,105 @@
+import type { AppDispatch, AppGetState } from 'app/store/store';
+import type { S } from 'services/api/types';
+import { $lastProgressEvent } from 'services/events/stores';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { buildOnInvocationComplete } from './onInvocationComplete';
+
+vi.mock('app/logging/logger', () => ({
+  logger: () => ({
+    debug: vi.fn(),
+    trace: vi.fn(),
+    info: vi.fn(),
+    warn: vi.fn(),
+    error: vi.fn(),
+  }),
+}));
+
+// Spies for the workflow-editor node execution side effects. Kept lazy so vi.mock hoisting is safe.
+const mockUpsertExecutionState = vi.fn();
+let mockNodeExecutionStates: Record<string, unknown> = {};
+vi.mock('features/nodes/hooks/useNodeExecutionState', () => ({
+  $nodeExecutionStates: { get: () => mockNodeExecutionStates },
+  upsertExecutionState: (...args: unknown[]) => mockUpsertExecutionState(...args),
+}));
+
+const mockGetUpdatedNodeExecutionState = vi.fn();
+vi.mock('services/events/nodeExecutionState', () => ({
+  getUpdatedNodeExecutionStateOnInvocationComplete: (...args: unknown[]) => mockGetUpdatedNodeExecutionState(...args),
+}));
+
+const buildEvent = (overrides: Partial<S['InvocationCompleteEvent']> = {}): S['InvocationCompleteEvent'] =>
+  ({
+    invocation: { type: 'some_node', id: 'inv-1' },
+    invocation_source_id: 'node-1',
+    result: {},
+    origin: 'workflows',
+    destination: 'canvas',
+    user_id: 'owner-1',
+    item_id: 1,
+    ...overrides,
+  }) as unknown as S['InvocationCompleteEvent'];
+
+const makeGetState = (user: { user_id: string } | null): AppGetState =>
+  (() => ({ auth: { user } })) as unknown as AppGetState;
+
+const seedProgressEvent = () => {
+  const progress = { queue_id: 'default', item_id: 1 } as unknown as S['InvocationProgressEvent'];
+  $lastProgressEvent.set(progress);
+  return progress;
+};
+
+beforeEach(() => {
+  mockUpsertExecutionState.mockReset();
+  mockGetUpdatedNodeExecutionState.mockReset();
+  mockNodeExecutionStates = {};
+  $lastProgressEvent.set(null);
+});
+
+describe('buildOnInvocationComplete cross-user isolation', () => {
+  it("ignores another user's completion event entirely (admin receiving via admin room)", async () => {
+    // An admin has a local workflow node with the same source id in progress, and a live progress event.
+    mockNodeExecutionStates = { 'node-1': { nodeId: 'node-1', status: 'IN_PROGRESS' } };
+    mockGetUpdatedNodeExecutionState.mockReturnValue({ nodeId: 'node-1', status: 'COMPLETED' });
+    const seededProgress = seedProgressEvent();
+
+    const dispatch = vi.fn() as unknown as AppDispatch;
+    const handler = buildOnInvocationComplete(makeGetState({ user_id: 'admin-1' }), dispatch, new Map());
+
+    // The event belongs to a different user.
+    await handler(buildEvent({ user_id: 'other-user', origin: 'canvas_workflow_integration' }));
+
+    // No node execution state read/upsert, no canvas/gallery dispatches, progress event untouched.
+    expect(mockGetUpdatedNodeExecutionState).not.toHaveBeenCalled();
+    expect(mockUpsertExecutionState).not.toHaveBeenCalled();
+    expect(dispatch).not.toHaveBeenCalled();
+    expect($lastProgressEvent.get()).toBe(seededProgress);
+  });
+
+  it("processes the client's own completion event", async () => {
+    mockNodeExecutionStates = { 'node-1': { nodeId: 'node-1', status: 'IN_PROGRESS' } };
+    mockGetUpdatedNodeExecutionState.mockReturnValue({ nodeId: 'node-1', status: 'COMPLETED' });
+    seedProgressEvent();
+
+    const dispatch = vi.fn() as unknown as AppDispatch;
+    const handler = buildOnInvocationComplete(makeGetState({ user_id: 'owner-1' }), dispatch, new Map());
+
+    await handler(buildEvent({ user_id: 'owner-1' }));
+
+    expect(mockUpsertExecutionState).toHaveBeenCalledWith('node-1', expect.objectContaining({ nodeId: 'node-1' }));
+    // The handler clears the progress event at the end when it processes an event it owns.
+    expect($lastProgressEvent.get()).toBeNull();
+  });
+
+  it('processes events in single-user mode where there is no authenticated user', async () => {
+    mockNodeExecutionStates = { 'node-1': { nodeId: 'node-1', status: 'IN_PROGRESS' } };
+    mockGetUpdatedNodeExecutionState.mockReturnValue({ nodeId: 'node-1', status: 'COMPLETED' });
+
+    const dispatch = vi.fn() as unknown as AppDispatch;
+    const handler = buildOnInvocationComplete(makeGetState(null), dispatch, new Map());
+
+    await handler(buildEvent({ user_id: 'system' }));
+
+    expect(mockUpsertExecutionState).toHaveBeenCalledWith('node-1', expect.objectContaining({ nodeId: 'node-1' }));
+  });
+});
diff --git a/invokeai/frontend/web/src/services/events/onInvocationComplete.tsx b/invokeai/frontend/web/src/services/events/onInvocationComplete.tsx
index ea6a237d4b2..33e97452d80 100644
--- a/invokeai/frontend/web/src/services/events/onInvocationComplete.tsx
+++ b/invokeai/frontend/web/src/services/events/onInvocationComplete.tsx
@@ -1,5 +1,6 @@
 import { logger } from 'app/logging/logger';
 import type { AppDispatch, AppGetState } from 'app/store/store';
+import { selectCurrentUser } from 'features/auth/store/authSlice';
 import { canvasWorkflowIntegrationProcessingCompleted } from 'features/controlLayers/store/canvasWorkflowIntegrationSlice';
 import {
   selectAutoSwitch,
@@ -247,6 +248,22 @@ export const buildOnInvocationComplete = (
   return async (data: S['InvocationCompleteEvent']) => {
     log.debug({ data } as JsonObject, `Invocation complete (${data.invocation.type}, ${data.invocation_source_id})`);
 
+    // In multiuser mode, admins are subscribed to the "admin" socket room and therefore receive
+    // invocation events for *every* user, not just their own. Another user's completion event must
+    // not touch this client's state: it could mark our workflow-editor nodes complete and append the
+    // other user's outputs to matching node IDs, stop our canvas workflow integration spinner, insert
+    // their images into our gallery, or clear our own in-progress progress event. Bail out entirely
+    // before any of those side effects run.
+    //
+    // Only gate this when we actually know who is logged in. In single-user mode there is no
+    // authenticated user (selectCurrentUser is null) and every event is the local user's own, so
+    // we fall through and preserve the original behavior.
+    const currentUser = selectCurrentUser(getState());
+    if (currentUser && data.user_id !== currentUser.user_id) {
+      log.trace(`Skipping invocation complete for another user (${data.user_id})`);
+      return;
+    }
+
     const nodeExecutionState = $nodeExecutionStates.get()[data.invocation_source_id];
     const updatedNodeExecutionState = getUpdatedNodeExecutionStateOnInvocationComplete(
       nodeExecutionState,
diff --git a/invokeai/frontend/web/src/services/events/setEventListeners.tsx b/invokeai/frontend/web/src/services/events/setEventListeners.tsx
index 30f705d670e..dbaf71ffeca 100644
--- a/invokeai/frontend/web/src/services/events/setEventListeners.tsx
+++ b/invokeai/frontend/web/src/services/events/setEventListeners.tsx
@@ -536,6 +536,16 @@ export const setEventListeners = ({ socket, store, setIsConnected }: SetEventLis
     }
   });
 
+  socket.on('queue_counts_changed', (data) => {
+    // A content-free broadcast that the queue's global counts may have changed — typically
+    // because *another* user enqueued or one of their jobs changed status. We never receive
+    // those users' private queue item events, so this is the only signal that lets a non-admin's
+    // badge keep its global total (the "/Y" in "X/Y") and the in_progress-driven progress bar
+    // current. Only the redacted SessionQueueStatus is refetched; no per-user/batch caches.
+    log.trace({ data }, 'Queue counts changed');
+    dispatch(queueApi.util.invalidateTags(['SessionQueueStatus']));
+  });
+
   socket.on('queue_cleared', (data) => {
     log.debug({ data }, 'Queue cleared');
     dispatch(
diff --git a/invokeai/frontend/web/src/services/events/types.ts b/invokeai/frontend/web/src/services/events/types.ts
index 72239986fb3..89c2bcb5d3c 100644
--- a/invokeai/frontend/web/src/services/events/types.ts
+++ b/invokeai/frontend/web/src/services/events/types.ts
@@ -30,6 +30,11 @@ export type ServerToClientEvents = {
   model_install_cancelled: (payload: S['ModelInstallCancelledEvent']) => void;
   model_load_complete: (payload: S['ModelLoadCompleteEvent']) => void;
   queue_item_status_changed: (payload: S['QueueItemStatusChangedEvent']) => void;
+  // Content-free broadcast to the whole queue room: the global queue counts may have changed
+  // (some user enqueued or a job changed status). Carries only queue_id — no per-user data —
+  // so every subscriber can refetch the redacted queue status. Emitted by the backend socket
+  // layer, not the event bus, so it has no generated `S[...]` schema type.
+  queue_counts_changed: (payload: { queue_id: string }) => void;
   queue_cleared: (payload: S['QueueClearedEvent']) => void;
   batch_enqueued: (payload: S['BatchEnqueuedEvent']) => void;
   queue_items_retried: (payload: S['QueueItemsRetriedEvent']) => void;