Attempt by security transparent method 'Telerik.Reporting.OpenXmlRendering.Spreadsheet.Workbook..ctor()' to access security critical method

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Last Updated: 12 Jan 2026 19:49 by Ravi

Release 2024 Q1

Bruce

Created on: 20 Dec 2023 16:09

Category: Reporting

Type: Bug Report

Attempt by security transparent method 'Telerik.Reporting.OpenXmlRendering.Spreadsheet.Workbook..ctor()' to access security critical method

When my application runs in full trust permissions set, the following error is thrown if I have used the Telerik.Reporting.OpenXmlRendering NuGet package and try exporting to any of the OpenXML formats :

ERROR: Attempt by security transparent method 'Telerik.Reporting.OpenXmlRendering.Spreadsheet.Workbook..ctor()' to access security critical method 'DocumentFormat.OpenXml.Packaging.SpreadsheetDocument.Create(System.IO.Stream, DocumentFormat.OpenXml.SpreadsheetDocumentType)' failed.

1 comment

Ravi

Posted on: 12 Jan 2026 19:49

Also affects Telerik.Reporting.Processing and Configuration:
Attempt by security transparent method 'Telerik.Reporting.Processing.AssemblyRefManager.LoadAssembliesCore()' to access security critical method 'Telerik.Reporting.Configuration.ReportingConfiguration.get_Current()' failed.