CVE-2026-61448

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Cuando la extensi\u00f3n de un archivo subido no es reconocida por el paquete mime, Parse Server conserva el Content-Type proporcionado por el cliente. Un Content-Type malformado que no es un tipo de medio tipo/subtipo v\u00e1lido (p. ej., 'image', 'image/', o 'image//svg+xml') elude la lista de bloqueo fileUpload.fileExtensions y se almacena sin cambios. En los adaptadores de almacenamiento que persisten y sirven el Content-Type subido (como Amazon S3, Google Cloud Storage o Azure Blob Storage), un navegador no puede analizar el valor malformado y recurre al MIME-sniffing; un archivo cuyo cuerpo comienza con HTML se renderiza como HTML, ejecutando scripts incrustados en el origen de la aplicaci\u00f3n contra otros usuarios que abren la URL del archivo. El adaptador de almacenamiento GridFS predeterminado no se ve afectado. 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