CVE-2026-68559: Authorization Bypass Through User-Controlled Key

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...