GHSA-MX22-3794-2VPV Excelize: Unchecked pivot-cache field index in extractPivotTableFields causes unrecoverable panic

Summary extractPivotTableFields builds order := pc.getPivotCacheFieldsName from xl/pivotCache/pivotCacheDefinitionN.xml's list, then indexes it with values taken from a separately parsed xl/pivotTables/pivotTableN.xml part with zero cross-validation: orderfield.Fld where field.Fld is a raw...