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Sitefinity Release Notes

Sitefinity CMS 15.3.8527 (Patch)

October 27, 2025

What's new:

  • Sitefinity AI Assistant: Out-of-the-box AI assistant widget is now available for Next.js frontend (562525) Learn more...

What's fixed:

  • New dashboard page breaks after metadata change (559897)
  • Reindex failed when no provider for current site is selected (567494)
  • Protected document linked in a Content block leads to 404 (565262)
  • Tooltip message not showing when search reindex failed (567496)
  • ASP.NET Core Renderer: Content list widget fails to filter items based on Date field by current date (567736)
  • Deleting large files is slow or ends up with an error when using Azure blob storage provider (565056)
  • Site Sync: After deleting a language, pages with additional URL are failing (567780)
  • Cannot edit Content block on a page template after refreshing the template (564869)
  • Next.js Renderer: Template selection issue (565578)
  • Permissions for backend pages not respected (565157)
  • Directive value cannot be deleted, if it contains & symbol (567720)
  • ASP.NET Core Renderer: Loading an image without a thumbnail breaks the editor (570810)
  • ASP.NET Core Renderer: When adding custom attributes to a Content block, they are not rendered (568910)
  • Old classic UI visible during search on AdminApp screens - upon Enter event (570789)
  • Reindex operation fails when Forums module is deactivated (567766)
  • A/B test filtered by segment using Insight criteria does not work (571359)
  • The AI assistant widget for MVC is moved to a separate project and is now part of FeatherWidgets package, which resolves issue with SaaS deployments (568597)
  • The AI Hybrid search, image search by title and content does not work in Non default site (571214)
  • ASP.NET Core Renderer does not work when editing pages in non-default website and its non-default cultures (571052)
  • ASP.NET Core Renderer: A page from different site with the same culture is opened for edit when the UrlName values are the same (571054)

API and breaking changes:

  • The AI assistant widget for MVC is moved to a separate project and is now part of FeatherWidgets package. Assistant.Mvc.Controllers moved to Frontend.Assistant.Mvc.Controllers and Assistant.Mvc.Controllers moved to Frontend.Assistant.Mvc.Controllers (568597)

Product security updates:

  • Minor security improvements.
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