CVE-2026-68559 Wekan: Broken access control in the Excel-export route (`/api/boards/:boardId/exportExcel`)

Wekan is open source kanban built with Meteor. From 9.57 until 9.74, the /api/boards/:boardId/exportExcel route in models/exportExcel.js called the asynchronous exporterExcel.canExportuser authorization guard from models/server/ExporterExcel.js without awaiting it. The returned Promise was always...