NocoBase blocks .doc and .xls uploads due to content-based MIME detection flaw

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NocoBase's file manager rejects legacy Word and Excel uploads even when their MIME types are correctly listed in the allowlist, as discovered during testing on version 2.1.23. The platform inspects file contents rather than relying on browser-declared Content-Type or file extensions to determine MIME types. Legacy .doc and .xls files are identified as application/x-cfb due to their shared OLE2 Compound File Binary format, while modern .docx and .xlsx files register as application/zip — neither matching the standard Office MIME types users typically configure. To successfully permit these uploads, administrators must add application/x-cfb and application/zip to the allowlist instead of the conventional MIME type strings. This behavior particularly affects Japanese and Chinese enterprises that still rely heavily on legacy Office file formats.

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