Released: Apr 22, 2026

Aggiornamenti in 2026 Q1 (2026.1.421)

Funzionalità

• Common:
  • Updated Telerik Licensing minimal required version to 1.8.2.
  • Updated Telerik Document Processing Library (DPL) version to 2026.1.402.
• AsyncUpload (Breaking Changes):
  • CSRF validation is now enabled by default for all upload requests. Applications that do not use ASP.NET Session State must add to appSettings. Applications using WebResourceSession handler are not affected.
  • The legacy and already obsolete IFrame, Silverlight and Flash upload modules have been removed. RadAsyncUpload now exclusively uses the File API module.
  • The DisablePlugins property has been removed. Remove any references to it from your markup or code-behind.
  • The get_loadedModuleName() client-side method has been removed. Remove any calls to it from your client-side code.
  • The FileFilters property is no longer functional as it relied on the removed Flash and Silverlight modules. Use the HTML5 accept attribute on the file input instead.
  • The Telerik.Web.UI.RadAsyncUpload.Modules.Flash and Telerik.Web.UI.RadAsyncUpload.Modules.Silverlight client-side objects no longer exist. Remove any JavaScript workarounds referencing them.
• ClientDataSource:
  • Added OData v4 transport option.
• Editor:
  • MediaManager now outputs HTML5 video and audio elements for browser-supported formats (mp4, webm, ogv, mp3, wav, ogg, oga) instead of the obsolete object/embed tags. Legacy formats (e.g. avi, wmv) still use embed. The WMP Properties tab has been replaced with HTML5 attributes (controls, autoplay, loop, muted, preload) for supported formats.
  • Improved keyboard navigation and screen reader support in RadEditor toolbar dropdowns (FontName, FontSize, RealFontSize, ForeColor, BackColor, InsertSymbol, InsertTable etc.).
• NumericTextBox:
  • Added EnableMobilePattern property for triggering the numeric keyboard on mobile devices.
• PdfProcessing:
  • Optimized the export of Functions.
  • Improved font handling during document import.
  • Introduced API for Cloning RadFixedPages and for splitting RadFixedDocument into pages.
  • Implement AutoTag Tables from document Primitives.
  • Introduced support for PDF Portfolios.
  • Implemented Exponential Interpolation Function.
• SpreadProcessing:
  • XlsFormatProvider: Added support for hidden rows.
  • Added support for Superscript/Subscript formatting option.
  • Introduced support for notes in XLS format.
  • Added support for Strikethrough formatting option.
  • Introduced support for images when importing and exporting XLS documents.

Correzioni

• Security:
  • Fixed uncontrolled resource consumption vulnerability (CVE-2026-6022).
  • Fixed deserialization of untrusted data vulnerability (CVE-2026-6023).
• Filter:
  • Replaced Newtonsoft.Json dependency with a built-in serializer for filter expression serialization.
• DataPager:
  • Fixed 'field' keyword conflict in RadDataPagerDesigner property accessor causing design-time errors.
• Editor:
  • Design rendering failure with Uncaught TypeError: Cannot read properties of null (reading 'commonAncestorContainer') when using ToolbarMode="RibbonBarShowOnFocus".
  • Fixed issue where keyboard selection is not working in toolbar dropdowns (FontName, FontSize, RealFontSize).
  • Missing ARIA attributes on the HTML mode textarea when EnableAriaSupport is enabled.
  • Cell Properties - Preview only shows top-left cell styling when applying changes to multiple top-row cells.
• Grid:
  • Fixed HeaderContext filter menu throwing '_linkElement' undefined error after expand animation ends.
• PdfProcessing:
  • The import performance is reduced when having XObject instances with many Shading elements.
  • PdfStreamWriter: Merging PDF documents causes blank pages.
  • Fixed issue where an InvalidCastException is thrown when importing a document.
  • Fixed issue where a NullReferenceException is thrown when importing a document with EmbeddedFile without Subtype.
• SpeechToTextButton:
  • Fixed SpeechToTextButton Designer throwing an error at design time.
• SpreadProcessing:
  • SpreadProcessing: XLSX image lock aspect ratio imports incorrectly when importing a document with PictureLockingElement which noChangeAspect attribute is boolean.
  • XlsFormatProvider: InvalidOperationException is thrown when importing a document with an unsupported BIFF record.
  • Importing file with comments part with other name than comments.xml throws an exception.
• Window:
  • RadWindow predefined dialogs do not fully expose required accessibility attributes.
• WordsProcessing:
  • PdfFormatProvider: Justified text alignment is not respected for specific text content.