diff --git a/.jules/palette.md b/.jules/palette.md
index bd0f73248..869be9e7b 100644
--- a/.jules/palette.md
+++ b/.jules/palette.md
@@ -57,3 +57,7 @@
 ## 2026-07-30 - Add window.confirm for destructive actions
 **Learning:** Destructive actions like deleting groups and edge relationships previously occurred immediately without user confirmation.
 **Action:** Always wrap delete operations with window.confirm() dialogs and ensure corresponding tests successfully mock window.confirm.
+
+## 2024-09-04 - Accessible disabled button hints
+**Learning:** Using the native HTML `disabled` attribute on a button removes it from the document's tab order. This makes it impossible for screen reader and keyboard-only users to focus the button and hear any associated `aria-describedby` hints explaining why the button is disabled (such as access control warnings).
+**Action:** To create a fully accessible disabled button with an explanatory hint, use `aria-disabled={true}`, visually style it as disabled (e.g., `opacity: 0.5, cursor: "not-allowed"`), and manually block its action via `onClick={(e) => e.preventDefault()}`.
diff --git a/frontend/src/components/modals/ExportModal.test.tsx b/frontend/src/components/modals/ExportModal.test.tsx
index bd89c5384..1458e6848 100644
--- a/frontend/src/components/modals/ExportModal.test.tsx
+++ b/frontend/src/components/modals/ExportModal.test.tsx
@@ -176,8 +176,12 @@ describe('ExportModal', () => {
 
     expect(screen.getByText('접근 권한 관리는 프로젝트 권한 설정에서 처리합니다.')).toBeInTheDocument();
     const accessManagementButton = screen.getByRole('button', { name: '접근 관리' });
-    expect(accessManagementButton).toBeDisabled();
+    expect(accessManagementButton).toHaveAttribute('aria-disabled', 'true');
     expect(accessManagementButton).toHaveAttribute('aria-describedby', 'share-export-access-hint');
     expect(accessManagementButton).not.toHaveAttribute('title');
+
+    // Verify it is still keyboard-focusable
+    accessManagementButton.focus();
+    expect(accessManagementButton).toHaveFocus();
   });
 });
diff --git a/frontend/src/components/modals/ExportModal.tsx b/frontend/src/components/modals/ExportModal.tsx
index 995393ceb..9ccda8ad9 100644
--- a/frontend/src/components/modals/ExportModal.tsx
+++ b/frontend/src/components/modals/ExportModal.tsx
@@ -202,7 +202,8 @@ export function ExportModal({
               )}
               <button
                 type="button"
-                disabled
+                aria-disabled={true}
+                onClick={(e) => e.preventDefault()}
                 aria-describedby="share-export-access-hint"
                 className="exportModal__disabledHintButton"
               >
diff --git a/frontend/src/styles.css b/frontend/src/styles.css
index 3605ce9fb..47b94328a 100644
--- a/frontend/src/styles.css
+++ b/frontend/src/styles.css
@@ -729,7 +729,8 @@ button:disabled {
 }
 
 .exportModal__disabledHintButton {
-  opacity: 0.9;
+  opacity: 0.5;
+  cursor: not-allowed;
 }
 
 .exportModal__hint {