GHSA-QVVF-Q994-X79V SiYuan importSY/importZipMd: path traversal via multipart filename enables arbitrary file write

Summary POST /api/import/importSY and POST /api/import/importZipMd write uploaded archives to a path derived from the multipart filename field without sanitization, allowing an admin to write files to arbitrary locations outside the temp directory - including system paths that enable RCE. Details...