Release History

Telerik UI for ASP.NET MVC 2026.3.1015

October 15, 2026

Common

NEW

• New FloatingToolBar Component
• Security Hardening

FIXED

• Creating custom script with the source scripts throws an error (#8527)
• Error when building the source scripts (#8521)
• Incorrect package dependency for Telerik.UI.for.AspNet.Mvc5 (#8517)
• TypeScript errors with version 2026.3.811
• Source mapping does not allow debugging of kendo.all.min.js (#8501)

Dependencies

• Telerik Document Processing Library (DPL) version (2026.3.810)
• Fluent Theme Package (v14.6.1)
• Classic Theme Package (v14.6.1)
• Bootstrap Theme Package (v14.6.1)
• Default Theme Package (v14.6.1)
• Material Theme Package (v14.6.1)

Badge

FIXED

• Binding renders raw HTML on a Badge component

ButtonGroup

FIXED

• ToolBar buttonGroup buttons.url sanitizer bypass permits injected event-handler attributes

Calendar

FIXED

• The month content template renders data.url and data.title unencoded

ChainOfThought

NEW

• LLM Response Primitives style corrections

Breaking Changes

• ChainOfThought option children changed to content

Citation

NEW

• LLM Response Primitives style corrections

ContextMenu

NEW

• Increased Menu items size

Diagram

FIXED

• Tooltip does not clear on Diagram destroy (#8523)
• JS error on defining Diagram Tools

Dialog

FIXED

• Kendo Dialog is displayed behind modal Window (#8515)

DropDownList

FIXED

• Setting autoWidth true breaks height in mobile adaptiveMode (#8355)

Editor

NEW

• Updated Window actions buttons rendering in Editor and PropertyGrid

FIXED

• FileBrowser/ImageBrowser remote name fields render as HTML and execute JavaScript

FileManager

FIXED

• FileManager drag hint renders remote item names as HTML and executes JavaScript
• The pager info in the FileManager Grid view is displayed incorrectly when pageable.pageSize configuration is set

Grid

NEW

• Group text is not bold with themes 14.5.0 version

FIXED

• Missing k-grid-md class on MVC Grid if .Size(ComponentSize.Medium) is set (#8522)
• Boolean filter is not applied correctly (#8533)
• Unexpected horizontal scrollbar on vertically scrollable Grid initialized from table
• Grid MultiColumn Headers Not Excel Exporting With Hidden Columns (#8502)
• Method resizeColumn does not work correctly when width is initially set in pixels (#8483)
• Grid with virtualization does not fill the entire tables with items after sorting (#8421)
• Empty Grid displays horizontal scrollbar (#8367)

ListBox

FIXED

• ListBox DEFAULT item template renders the bound dataTextField as raw HTML

Menu

NEW

• Increased Menu items size

FIXED

• A bound Menu dataSource field becomes an event-handler attribute - three attribute serialisers concatenate where three sibling widgets use .attr()
• TabStrip/Menu/PanelBar inject the dataSource "imageUrl" field into a single-quoted src attribute with no escaping

MultiSelect

FIXED

• Expose Null assignment for SummarizeAfter configuration of MultiSelect

MultiViewCalendar

FIXED

• The month content template renders data.url and data.title unencoded

PanelBar

FIXED

• TabStrip/Menu/PanelBar inject the dataSource "imageUrl" field into a single-quoted src attribute with no escaping
• PanelBar dataSource.url raw href rendering permits event-handler attribute injection

PivotGridV2

FIXED

• The PivotConfiguratorV2 will request `undefined` if no read url is provided initially

PropertyGrid

NEW

• Updated Window actions buttons rendering in Editor and PropertyGrid

Scheduler

FIXED

• Scheduler delete/edit confirmation dialog removes scrollbar from page
• Scheduler resource colors renders raw event wrapper attributes and permits event-handler injection
• When Scheduler's editable.create is set to false, the "New Event" button is still rendered (#8534)
• Segmented control and dropdown list are displayed in Scheduler with a custom toolbar (#8516)
• Add Missing Scheduler Localization (#8535)

Signature

FIXED

• Signature triggers open and close events upon initialization

Splitter

FIXED

• Splitter, Window and Tooltip build their iframe src without kendo.sanitizeLink - a URL containing an apostrophe injects an attribute

Spreadsheet

FIXED

• Border disappears after deleting a row (#8426)

Switch

FIXED

• Invalid attribute readonly for input type="checkbox" rendered by Switch

TabStrip

FIXED

• TabStrip/Menu/PanelBar inject the dataSource "imageUrl" field into a single-quoted src attribute with no escaping

ToolBar

FIXED

• ToolBar buttonGroup buttons.url sanitizer bypass permits injected event-handler attributes

Tooltip

FIXED

• Splitter, Window and Tooltip build their iframe src without kendo.sanitizeLink - a URL containing an apostrophe injects an attribute
• Tooltip callout is positioned outside the popup (#8519)
• Tooltip with remote content does not respect the width and height sizes (#8512)

TreeList

FIXED

• TreeList header title is not wrapped in a span element with 'k-column-title' class when sortable is false (#8394)

Validator

FIXED

• Validator HTML-decodes the validation message and parses it as markup - an attribute the page author correctly escaped becomes live HTML

Window

FIXED

• Splitter, Window and Tooltip build their iframe src without kendo.sanitizeLink - a URL containing an apostrophe injects an attribute
• Kendo Dialog is displayed behind modal Window (#8515)