diff --git a/src/composables/__tests__/useInterceptNotifications.spec.js b/src/composables/__tests__/useInterceptNotifications.spec.js
new file mode 100644
index 00000000000..bca8243a71a
--- /dev/null
+++ b/src/composables/__tests__/useInterceptNotifications.spec.js
@@ -0,0 +1,67 @@
+/*!
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+import { emit } from '@nextcloud/event-bus'
+import { mount } from '@vue/test-utils'
+import { afterAll, afterEach, describe, expect, test, vi } from 'vitest'
+import { useInterceptNotifications } from '../useInterceptNotifications.ts'
+
+const router = { push: vi.fn(() => new Promise(() => {})) }
+
+vi.mock('vue-router', () => ({ useRouter: () => router }))
+vi.mock('vuex', () => ({ useStore: () => ({}) }))
+vi.mock('../../stores/federation.ts', () => ({ useFederationStore: () => ({}) }))
+
+describe('useInterceptNotifications', () => {
+	const wrapper = mount({
+		setup() {
+			useInterceptNotifications()
+			return () => null
+		},
+	})
+
+	afterAll(() => {
+		wrapper.unmount()
+	})
+
+	afterEach(() => {
+		router.push.mockClear()
+	})
+
+	test('cancels a conversation link synchronously, before navigation finishes', () => {
+		const event = {
+			cancelAction: false,
+			notification: { app: 'spreed' },
+			action: { type: 'WEB', url: 'https://cloud.example.com/index.php/call/abc123#message_42' },
+		}
+		emit('notifications:action:execute', event)
+
+		expect(event.cancelAction).toBe(true)
+		expect(router.push).toHaveBeenCalledWith('/call/abc123#message_42')
+	})
+
+	test('keeps default behavior for links without a conversation', () => {
+		const event = {
+			cancelAction: false,
+			notification: { app: 'spreed' },
+			action: { type: 'WEB', url: 'https://cloud.example.com/index.php/settings/admin/talk' },
+		}
+		emit('notifications:action:execute', event)
+
+		expect(event.cancelAction).toBe(false)
+		expect(router.push).not.toHaveBeenCalled()
+	})
+
+	test('ignores notifications of other apps', () => {
+		const event = {
+			cancelAction: false,
+			notification: { app: 'files' },
+			action: { type: 'WEB', url: 'https://cloud.example.com/index.php/call/abc123' },
+		}
+		emit('notifications:action:execute', event)
+
+		expect(event.cancelAction).toBe(false)
+	})
+})
diff --git a/src/composables/useInterceptNotifications.ts b/src/composables/useInterceptNotifications.ts
index 0a9c3b9a8e8..87262e3bf7e 100644
--- a/src/composables/useInterceptNotifications.ts
+++ b/src/composables/useInterceptNotifications.ts
@@ -61,9 +61,9 @@ export function useInterceptNotifications() {
 				}
 
 				const conversationRouteLocationRaw = event.action.url.substring(conversationRouteIndex)
-				await router.push(conversationRouteLocationRaw)
-
+				// Must be set before the first await, the notifications app checks it right after emitting
 				event.cancelAction = true
+				await router.push(conversationRouteLocationRaw)
 				break
 			}
 			case 'POST': {