Sitefinity Release Notes

What's new

Sitefinity AI capabilities

• Optimization Hub in Sitefinity CMS backend

  Introducing Optimization Hub - AI-powered content optimization experience that is directly integrated into Sitefinity CMS backend. The new capability provides a centralized workspace for running multiple Sitefinity AI agents, already configured for analyzing Sitefinity content, against a defined set of your site content. It enables authorized users, such as marketers and content editors, to easily review, prioritize and apply AI-generated suggestions in bulk or individually, while maintaining full control over the changes made. Learn more...

• Generative engine optimization (GEO) Аgent

  Introducing Generative engine optimization (GEO) Agent - a built-in AI-powered capability that helps content editors identify and prioritize improvements to Sitefinity content and pages for traditional search engines and AI-powered search experiences. The AI agent scans existing content and assesses each item against SEO and AEO/GEO checklists. For each applicable criterion, it provides an explainable assessment supported by available evidence and identifies cases where there is insufficient information to assess. For criteria that need improvement, the agent generates actionable recommendations, including proposed replacement text or field values where appropriate. Content editors can review and apply these recommendations through the existing content editing workflow or through the integrated DX Assistant and Optimization Hub experiences. Learn more...

• Hybrid backend search now supports pages

  Hybrid backend search, powered by Progress Agentic RAG, now also works with pages. It combines keyword matching and semantic search in the backend grids, so you can find pages by meaning, not just by exact keywords. In addition, the ASP.NET Core and Next.js based pages are now indexed by their full HTML, so search results reflect the complete page content. Learn more...

General capabilities and improvements

• Inline editing for Content block and Form widgets

  You can now edit Content block and Form widgets directly on pages and page templates by double-clicking them. While editing inline, typing / on a new line opens a menu with formatting options. NOTE: This capability is currently available for ASP.NET Core and Next.js pages. Learn more... (ASP.NET Core) Learn more... (Next.js)

• Facets are now supported for Lucene search

  Search facets are now supported for the Lucene search service, in addition to Azure AI Search and Elasticsearch. You can specify fields as facetable in a Lucene-based search index and use the Search facets widget to let site visitors narrow down the search results. NOTE: Affected customers with projects using Lucene search must reindex after upgrading to Sitefinity 15.4.8640. Learn more...

What's fixed

• Related Media: Selector dialog doesn't show all the data sources for replacing a document for a specific translation (601333)
• Media: Image uploads fail for filenames with special or non-Latin characters when chunked uploads are enabled (603460)
• Agentic RAG based Search: Pages not ingested with Live and Draft content for Backend search index and System connection (595557)
• Agentic RAG based Search: Dynamic content publishing is slow when the System connection knowledge box is active (602298)
• Next.js Renderer: Cannot save a widget when complex object contains a property removed from its model (603985)
• Next.js Renderer: Detail pages return '404' when the item's UrlName contains a period (604506)
• ASP.NET Core Renderer: Copy/Paste settings function of the widgets removes the saved settings on the initial translation (601647)
• ASP.NET Core Renderer: Web Service access restriction is case-sensitive on the URL (603555)
• Forms: Back button on form edition locks the form (601079)
• Unrestricted file upload in Libraries (582863)
• Blob Storage: Test settings throws 'ArgumentNullException' when SAS is set via connection string (601377)
• Migration tool: During migration, grid widget with custom name is not resolved from resourcePackages folder (600265)
• Search performance degradation and GetAnalyzer() behavior after upgrading Sitefinity (601883)
• Ctrl+F closes backend navigation dropdown in Firefox (596158)
• Multisite: A path segment in a site's domain alias is incorrectly included in generated page URLs, content links, canonical tags, and sitemap entries (600728)
• Cache invalidation issue - Removed schema markup still rendered on the page (603361)
• Lucene search with 'Lucene.Net.Analysis.Cjk.CJKAnalyzer' cannot find the Chinese content (602778)
• Taxonomies: Backend search in one classification returns results from all classifications (603785)
• Improve document extraction logic to support Excel files (XLSX and XLSM) (598106)
• Sitefinity Insight: Personalized widget disappears when configuring "Tracking cookie domain" (600631)
• TableView with LinkModel link selector returns 'null' after TableView reorder (604395)
• Server cannot append header after HTTP headers have been sent when roles CDN cache cookie is enabled (604749)
• Web Services: Sitefinity returns 'HTTP 500' from Default.LazyComponents when the URL parameter does not resolve to a site node (604536)
• When inserting a link in a Rich Text field with its URL set to the base site URL, after publishing, the URL is modified to '/home' redirect (601851)
• Output cache: OCD item stuck in 'Deleted' status after rapid-fire CacheInvalidationEvents, preventing subsequent cache invalidation on Redis distributed cache provider (605326)

Third-party libraries update

• ServiceStack - 10.2.0
• System.Text.Json - 10.0.12
• AWSSDK.Core - 4.0.102.3
• AWSSDK.DynamoDBv2 - 4.0.103.6
• AWSSDK.S3 - 4.0.103
• AWSSDK.SQS - 4.0.100.12
• HtmlSanitizer - 9.2.1039
• AngleSharp - 1.8.2
• AngleSharp.Css - 1.1.2
• System.Collections.Immutable - 10.0.11
• Telerik.Windows.Controls.for.Wpf - 2026.3.812
• Telerik.Windows.Data.for.Wpf - 2026.3.812
• Telerik.Windows.Documents.for.Wpf - 2026.3.812
• Telerik.Windows.Documents.Core - 2026.3.810
• Telerik.Windows.Documents.Fixed - 2026.3.810
• Telerik.Windows.Documents.Flow - 2026.3.810
• Telerik.Windows.Documents.FormatProviders.Html.for.Wpf - 2026.3.812
• Telerik.Windows.Documents.FormatProviders.OpenXml.for.Wpf - 2026.3.812
• Telerik.Windows.Documents.FormatProviders.Rtf.for.Wpf - 2026.3.812
• Telerik.Windows.Documents.Spreadsheet.FormatProviders.OpenXml - 2026.3.810
• Telerik.Windows.Documents.Spreadsheet - 2026.3.810
• Telerik.Windows.Zip - 2026.3.810
• Removed: Telerik.Sitefinity.Translations.ClayTablet
• Removed: Progress.Sitefinity.Centaur.All
• Removed: HtmlAgilityPack

IMPORTANT: Starting with Sitefinity CMS 15.4.8640, thе Sitefinity Admin App extensions repository and Sitefinity Admin App itself use Angular 21 (previously, Angular 19). This update introduces a breaking change for developed extensions. To maintain compatibility, affected customers are required to apply manual actions. Learn more...

API and breaking changes

• Sitefinity Admin App extensions repository and Sitefinity Admin App itself now use Angular v21. To maintain compatibility for existing extensions, affected customers are required to apply manual actions. Learn more...
• Search facets are now supported for Lucene search. Affected customers with projects using Lucene search must reindex after upgrading to Sitefinity 15.4.8640. Learn more...
• API changes in Sitefinity CMS Learn more...

Deprecated capabilities

• Personalization based on HubSpot score has been discontinued due to HubSpot deprecating the required feature in their product. Learn more...
• Clay Tablet translation connector has been deprecated and removed from the product. Use the Lionbridge connector as a supported alternative. Learn more...