diff --git a/frontend/src/components/input/editor/TipTap.vue b/frontend/src/components/input/editor/TipTap.vue
index 70ac31e91..3aef2de87 100644
--- a/frontend/src/components/input/editor/TipTap.vue
+++ b/frontend/src/components/input/editor/TipTap.vue
@@ -722,7 +722,7 @@ async function addImage(event: Event) {
 		return
 	}
 
-	const url = await inputPrompt(event.target.getBoundingClientRect())
+	const url = await inputPrompt(event.target.getBoundingClientRect(), '', editor.value)
 
 	if (url) {
 		editor.value?.chain().focus().setImage({src: url}).run()
diff --git a/frontend/src/components/input/editor/setLinkInEditor.ts b/frontend/src/components/input/editor/setLinkInEditor.ts
index f5f547ff4..b1fa4e88e 100644
--- a/frontend/src/components/input/editor/setLinkInEditor.ts
+++ b/frontend/src/components/input/editor/setLinkInEditor.ts
@@ -3,7 +3,7 @@ import inputPrompt from '@/helpers/inputPrompt'
 
 export async function setLinkInEditor(pos: DOMRect, editor: Editor | null | undefined) {
 	const previousUrl = editor?.getAttributes('link').href || ''
-	const url = await inputPrompt(pos, previousUrl)
+	const url = await inputPrompt(pos, previousUrl, editor ?? undefined)
 
 	// empty
 	if (url === '') {
diff --git a/frontend/src/helpers/inputPrompt.ts b/frontend/src/helpers/inputPrompt.ts
index 11dd3325f..77b70e089 100644
--- a/frontend/src/helpers/inputPrompt.ts
+++ b/frontend/src/helpers/inputPrompt.ts
@@ -2,10 +2,17 @@ import {createRandomID} from '@/helpers/randomId'
 import {computePosition, flip, shift, offset} from '@floating-ui/dom'
 import {nextTick} from 'vue'
 import {eventToShortcutString} from '@/helpers/shortcut'
+import type {Editor} from '@tiptap/core'
+import {getPopupContainer} from '@/components/input/editor/popupContainer'
 
-export default function inputPrompt(pos: ClientRect, oldValue: string = ''): Promise<string> {
+export default function inputPrompt(pos: ClientRect, oldValue: string = '', editor?: Editor): Promise<string> {
 	return new Promise((resolve) => {
 		const id = 'link-input-' + createRandomID()
+		// Append inside the open task <dialog> (top-layer) when present, otherwise
+		// document.body. A body-level popup is painted behind a showModal() dialog
+		// and unfocusable through its focus trap, breaking the link prompt in the
+		// Kanban task popup (#2940).
+		const container = getPopupContainer(editor)
 
 		// Create popup element
 		const popupElement = document.createElement('div')
@@ -26,7 +33,7 @@ export default function inputPrompt(pos: ClientRect, oldValue: string = ''): Pro
 		inputElement.value = oldValue
 		wrapperDiv.appendChild(inputElement)
 		popupElement.appendChild(wrapperDiv)
-		document.body.appendChild(popupElement)
+		container.appendChild(popupElement)
 
 		// Create a local mutable copy of the position for scroll tracking
 		let currentRect = new DOMRect(pos.left, pos.top, pos.width, pos.height)
@@ -84,8 +91,8 @@ export default function inputPrompt(pos: ClientRect, oldValue: string = ''): Pro
 
 		const cleanup = () => {
 			window.removeEventListener('scroll', handleScroll, true)
-			if (document.body.contains(popupElement)) {
-				document.body.removeChild(popupElement)
+			if (container.contains(popupElement)) {
+				container.removeChild(popupElement)
 			}
 		}
 
diff --git a/frontend/tests/e2e/editor/link-prompt-kanban-popup.spec.ts b/frontend/tests/e2e/editor/link-prompt-kanban-popup.spec.ts
new file mode 100644
index 000000000..43fe85c75
--- /dev/null
+++ b/frontend/tests/e2e/editor/link-prompt-kanban-popup.spec.ts
@@ -0,0 +1,67 @@
+import {test, expect} from '../../support/fixtures'
+import {ProjectFactory} from '../../factories/project'
+import {ProjectViewFactory} from '../../factories/project_view'
+import {BucketFactory} from '../../factories/bucket'
+import {TaskFactory} from '../../factories/task'
+import {TaskBucketFactory} from '../../factories/task_buckets'
+
+// Regression test for #2940: in the Kanban task popup the description editor is
+// rendered inside a native <dialog> opened via showModal() (browser top-layer).
+// The link prompt used to be appended to document.body, so it was painted behind
+// the dialog and unfocusable through its focus trap, making "set link" a no-op.
+test.describe('Editor link prompt inside the Kanban task popup', () => {
+	test('creates a link in the description when opened as the Kanban popup', async ({authenticatedPage: page}) => {
+		const projects = await ProjectFactory.create(1)
+		const views = await ProjectViewFactory.create(1, {
+			id: 1,
+			project_id: projects[0].id,
+			view_kind: 3,
+			bucket_configuration_mode: 1,
+		})
+		const buckets = await BucketFactory.create(1, {
+			project_view_id: views[0].id,
+		})
+		const tasks = await TaskFactory.create(1, {
+			project_id: projects[0].id,
+			description: 'link me',
+			index: 1,
+		})
+		await TaskBucketFactory.create(1, {
+			task_id: tasks[0].id,
+			bucket_id: buckets[0].id,
+			project_view_id: views[0].id,
+		})
+
+		await page.goto(`/projects/${projects[0].id}/${views[0].id}`)
+
+		const card = page.locator('.kanban .bucket .tasks .task').filter({hasText: tasks[0].title})
+		await expect(card).toBeVisible()
+		await card.click()
+
+		// The task popup must be a native <dialog> in the top layer.
+		const dialog = page.locator('dialog[open]')
+		await expect(dialog).toBeVisible()
+		await expect(dialog.locator('.task-view')).toBeVisible()
+
+		const editButton = dialog.locator('.details.content.description .tiptap button.done-edit').filter({hasText: 'Edit'})
+		await expect(editButton).toBeVisible({timeout: 10000})
+		await editButton.click()
+
+		const description = dialog.locator('.details.content.description')
+		const editor = description.locator('[contenteditable="true"]').first()
+		await expect(editor).toBeVisible({timeout: 10000})
+		await editor.click()
+		await page.keyboard.press('ControlOrMeta+a')
+
+		await description.locator('.editor-toolbar__button').filter({hasText: 'Link'}).click()
+
+		const urlInput = dialog.locator('input.input[placeholder="URL"]')
+		await expect(urlInput).toBeVisible()
+		await urlInput.fill('https://vikunja.io')
+		await urlInput.press('Enter')
+
+		const link = editor.locator('a[href="https://vikunja.io"]')
+		await expect(link).toBeVisible()
+		await expect(link).toHaveText('link me')
+	})
+})