diff --git a/user-interface/src/lib/humble/broadcast-channel-humble.ts b/user-interface/src/lib/humble/broadcast-channel-humble.ts
new file mode 100644
index 000000000..eb803acdd
--- /dev/null
+++ b/user-interface/src/lib/humble/broadcast-channel-humble.ts
@@ -0,0 +1,19 @@
+export class BroadcastChannelHumble {
+  private channel: BroadcastChannel;
+
+  constructor(channelName: string) {
+    this.channel = new BroadcastChannel(channelName);
+  }
+
+  onMessage(handler: (event: MessageEvent) => void) {
+    this.channel.onmessage = handler;
+  }
+
+  postMessage(message: unknown) {
+    this.channel.postMessage(message);
+  }
+
+  close() {
+    this.channel.close();
+  }
+}
diff --git a/user-interface/src/login/Login.tsx b/user-interface/src/login/Login.tsx
index a7e9857a7..0b41b5262 100644
--- a/user-interface/src/login/Login.tsx
+++ b/user-interface/src/login/Login.tsx
@@ -21,6 +21,7 @@ import ApiConfiguration from '@/configuration/apiConfiguration';
 import { CamsUser } from '@common/cams/users';
 import { CamsSession } from '@common/cams/session';
 import { SUPERUSER } from '@common/cams/test-utilities/mock-user';
+import { initializeBroadcastLogout } from '@/login/broadcast-logout';
 
 export type LoginProps = PropsWithChildren & {
   provider?: LoginProvider;
@@ -42,6 +43,7 @@ export function Login(props: LoginProps): React.ReactNode {
 
   addApiAfterHook(http401Hook);
   initializeInactiveLogout();
+  initializeBroadcastLogout();
 
   const session: CamsSession | null = LocalStorage.getSession();
   if (session) {
diff --git a/user-interface/src/login/SessionEnd.tsx b/user-interface/src/login/SessionEnd.tsx
index 7a3bb376a..150f9756a 100644
--- a/user-interface/src/login/SessionEnd.tsx
+++ b/user-interface/src/login/SessionEnd.tsx
@@ -5,6 +5,7 @@ import Button from '@/lib/components/uswds/Button';
 import { LocalStorage } from '@/lib/utils/local-storage';
 import { LOGIN_PATH, LOGOUT_SESSION_END_PATH } from './login-library';
 import { BlankPage } from './BlankPage';
+import { broadcastLogout } from '@/login/broadcast-logout';
 
 export function SessionEnd() {
   const location = useLocation();
@@ -16,6 +17,7 @@ export function SessionEnd() {
 
   LocalStorage.removeSession();
   LocalStorage.removeAck();
+  broadcastLogout();
 
   useEffect(() => {
     if (location.pathname !== LOGOUT_SESSION_END_PATH) {
diff --git a/user-interface/src/login/broadcast-logout.test.ts b/user-interface/src/login/broadcast-logout.test.ts
new file mode 100644
index 000000000..4282e50e8
--- /dev/null
+++ b/user-interface/src/login/broadcast-logout.test.ts
@@ -0,0 +1,48 @@
+import { BroadcastChannelHumble } from '@/lib/humble/broadcast-channel-humble';
+import {
+  broadcastLogout,
+  handleLogoutBroadcast,
+  initializeBroadcastLogout,
+} from '@/login/broadcast-logout';
+
+describe('Broadcast Logout', () => {
+  test('should handle broadcast-logout properly', () => {
+    const postMessageSpy = vi
+      .spyOn(BroadcastChannelHumble.prototype, 'postMessage')
+      .mockReturnValue();
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-function-type
+    let onMessageFn: Function = vi.fn();
+    const onMessageSpy = vi
+      .spyOn(BroadcastChannelHumble.prototype, 'onMessage')
+      .mockImplementation((arg) => {
+        onMessageFn = arg;
+      });
+
+    const closeSpy = vi.spyOn(BroadcastChannelHumble.prototype, 'close').mockReturnValue();
+
+    Object.defineProperty(global, 'window', Object.create(window));
+    global.window.location = {
+      host: 'some-host',
+      protocol: 'http:',
+      assign: function (_url: string | URL): void {},
+    } as unknown as Location;
+    const assignSpy = vi.spyOn(global.window.location, 'assign');
+    const expectedUrl =
+      global.window.location.protocol + '//' + global.window.location.host + '/logout';
+
+    initializeBroadcastLogout();
+    broadcastLogout();
+
+    // Validate broadcastLogout function
+    expect(postMessageSpy).toHaveBeenCalledWith('Logout all windows');
+
+    // Validate initializeBroadcastLogout function
+    expect(onMessageSpy).toHaveBeenCalledWith(handleLogoutBroadcast);
+    expect(onMessageFn).toEqual(handleLogoutBroadcast);
+
+    // Validate handleLogout function
+    onMessageFn();
+    expect(closeSpy).toHaveBeenCalled();
+    expect(assignSpy).toHaveBeenCalledWith(expectedUrl);
+  });
+});
diff --git a/user-interface/src/login/broadcast-logout.ts b/user-interface/src/login/broadcast-logout.ts
new file mode 100644
index 000000000..2c836acec
--- /dev/null
+++ b/user-interface/src/login/broadcast-logout.ts
@@ -0,0 +1,20 @@
+import { BroadcastChannelHumble } from '@/lib/humble/broadcast-channel-humble';
+import { LOGOUT_PATH } from '@/login/login-library';
+
+let channel: BroadcastChannelHumble;
+
+export function handleLogoutBroadcast() {
+  const { host, protocol } = window.location;
+  const logoutUri = protocol + '//' + host + LOGOUT_PATH;
+  window.location.assign(logoutUri);
+  channel?.close();
+}
+
+export function initializeBroadcastLogout() {
+  channel = new BroadcastChannelHumble('CAMS_logout');
+  channel.onMessage(handleLogoutBroadcast);
+}
+
+export function broadcastLogout() {
+  channel?.postMessage('Logout all windows');
+}
diff --git a/user-interface/vitest.config.mts b/user-interface/vitest.config.mts
index d43a5f88b..e3200b264 100644
--- a/user-interface/vitest.config.mts
+++ b/user-interface/vitest.config.mts
@@ -27,6 +27,7 @@ export default defineConfig({
         '**/data-verification/consolidation/ConsolidationOrderAccordionView.tsx',
         '**/data-verification/consolidation/*Mock.ts',
         '**/*.d.ts',
+        '**/**humble.ts',
         ...coverageConfigDefaults.exclude,
       ],
       thresholds: {