제출 #801781: mettle sendportal v3.0.1 Insecure direct object reference

Summary
The destroy() method in WorkspaceInvitationsController allows any workspace owner to delete invitations belonging to any other workspace (IDOR - CWE-639).

Vulnerability Details
File: app/Http/Controllers/Workspaces/WorkspaceInvitationsController.php, lines 42-47

public function destroy(Invitation $invitation): RedirectResponse
{
$invitation->delete(); // No workspace ownership check
return redirect()->route('users.index');
}

The route group at routes/web.php line 59 applies OwnsCurrentWorkspace::class middleware, which verifies the user owns their current workspace — but does NOT verify the {invitation} parameter belongs to that workspace. Laravel route model binding resolves ANY invitation by ID.

Secure pattern comparison:

The store() method in the same controller correctly scopes to the current workspace via $request->user()->currentWorkspace(). The invitations table has a workspace_id foreign key but it is never validated in destroy().

Recommended Fix
public function destroy(Invitation $invitation): RedirectResponse
{
abort_unless(
$invitation->workspace_id === auth()->user()->currentWorkspace()->id,
404
);
$invitation->delete();
return redirect()->route('users.index');
}

Disclosure
Found during security research. Happy to provide additional details.

• 원천: ⚠️ https://github.com/mettle/sendportal/issues/337
• 사용자: B1scuit (UID 97177)
• 제출: 2026. 04. 10. AM 06:51 (2 개월 ago)
• 모더레이션: 2026. 04. 26. PM 09:53 (17 days later)
• 상태: 수락
• VulDB 항목: 359744 [mettle sendportal 까지 3.0.1 Invitation WorkspaceInvitationsController.php destroy invitation 권한 상승]
• 포인트들: 20