Issues

• [Breaking change]: Forms Security will be replaced by CMS user group permissions in Umbraco Forms 20

  category/binary-incompatiblecategory/breakingcategory/source-incompatibleforms/release/20.0.0
  umbraco/Announcements#37 · Filter by author rickbutterfield opened on Oct 21, 2026

• [Breaking change]: Umbraco Search replaces existing search in Umbraco 19

  category/breaking
  umbraco/Announcements#36 · Filter by author kjac opened on Jun 26, 2026

• [Breaking change]: Remove the built-in Bootstrap 3 horizontal forms theme from Umbraco Forms

  category/breakingcategory/source-incompatibleforms/release/19.0.0
  umbraco/Announcements#35 · Filter by author rickbutterfield opened on May 7, 2026

• [Breaking change]: Replace Pikaday with native HTML date input in the Umbraco Forms default theme

  category/breakingcategory/source-incompatibleforms/release/19.0.0
  umbraco/Announcements#34 · Filter by author rickbutterfield opened on May 7, 2026

• [Breaking change]: Remove jQuery Validation support from Umbraco Forms client-side scripts

  category/breakingcategory/source-incompatibleforms/release/19.0.0
  umbraco/Announcements#33 · Filter by author rickbutterfield opened on May 7, 2026

• [Breaking change]: Replace Swashbuckle.AspNetCore with Microsoft.AspNetCore.OpenApi for Open API document generation

  category/binary-incompatiblecategory/breakingcategory/source-incompatiblecms/release/18.0.0
  umbraco/Announcements#32 · Filter by author lauraneto opened on Apr 29, 2026
  5

• [Breaking change]: Umbraco UI Library 2.0 — consolidation to a single package

  category/breakingcategory/source-incompatiblecms/release/18.0.0status/announcementuui/release/2.0
  umbraco/Announcements#31 · Filter by author iOvergaard opened on Apr 23, 2026

• [Breaking change]: Casing on EF Core code constructs

  category/breakingcms/release/18.0.0
  umbraco/Announcements#30 · Filter by author AndyButland opened on Apr 2, 2026

• [Breaking change]: Removal of backoffice tours

  category/breakingcms/release/17.0.0
  umbraco/Announcements#29 · Filter by author AndyButland opened on Oct 14, 2025
  1

• [Breaking change]: Removal of BackOfficeDevelopment runtime mode and InMemoryAuto models builder mode due to deprecation of Razor runtime compilation support in .NET

  category/breakingcms/release/17.0.0
  umbraco/Announcements#28 · Filter by author AndyButland opened on Oct 14, 2025
  6

• [Breaking change]: Serverside generated preview URLs

  category/breaking
  umbraco/Announcements#27 · Filter by author kjac opened on Sep 5, 2025

• [Breaking change]: Services refactoring from Umbraco 18

  category/breaking
  umbraco/Announcements#26 · Filter by author AndyButland opened on Aug 6, 2025
  1

• [Breaking change]: One-off licensing model discontinued in Umbraco Forms 17

  category/breakingforms/release/17.0.0
  umbraco/Announcements#25 · Filter by author TvGessel opened on Jun 11, 2025
  24

• [Breaking change]: Removal of unused or unnecessary extension methods

  category/binary-incompatiblecategory/breakingcategory/source-incompatiblecms/release/17.0.0
  umbraco/Announcements#24 · Filter by author AndyButland opened on Feb 21, 2025
  2

• [Breaking change]: Extension Manifest Type Architecture + Constants/Modal Tokens/Types moved to their package

  category/breakingcategory/source-incompatiblecms/release/15.0.0status/announcement
  umbraco/Announcements#22 · Filter by author nielslyngsoe opened on Oct 25, 2024
  6

• [Breaking change]: Settings will change from Arrays to ISet<T>s in Umbraco 16

  category/binary-incompatiblecategory/breakingcategory/source-incompatiblecms/release/16.0.0status/announcement
  umbraco/Announcements#21 · Filter by author bergmania opened on Oct 8, 2024

• [Breaking change]: TinyMCE will be removed in Umbraco 16

  category/binary-incompatiblecategory/breakingcategory/source-incompatiblecms/release/16.0.0
  umbraco/Announcements#20 · Filter by author iOvergaard opened on Sep 16, 2024
  2

• [Breaking change]: Umbraco Commerce v15 will become async only

  category/breaking
  umbraco/Announcements#19 · Filter by author mattbrailsford opened on Aug 19, 2024

• [Breaking change]: Access claims will be removed from ClaimsIdentity in V18

  category/breakingcms/release/18.0.0
  umbraco/Announcements#18 · Filter by author kjac opened on Jun 25, 2024
  3

• [Breaking change]: V14 webhooks changes casing in payload serialization

  category/breakingcms/release/14.0.0
  umbraco/Announcements#17 · Filter by author kjac opened on Jun 25, 2024

• [Breaking change]: Block Level Variations

  category/breakingcms/release/15.0.0
  umbraco/Announcements#16 · Filter by author kjac opened on May 22, 2024
  10

• [Breaking change]: GetAll on services will change behavior in Umbraco 15

  category/breakingcms/release/15.0.0
  umbraco/Announcements#15 · Filter by author lassefredslund opened on May 14, 2024

• [Breaking change]: Macros will be removed in Umbraco 14

  category/breakingcms/release/14.0.0
  umbraco/Announcements#14 · Filter by author lassefredslund opened on Mar 4, 2024

• [Breaking change]: User accounts will be prevented from creating simultaneous sessions by default in Umbraco 13

  category/breakingcms/release/13.0.0
  umbraco/Announcements#13 · Filter by author elit0451 opened on Oct 23, 2023

• [Breaking change]: Default property value converters will be added for all value types in Umbraco 13

  category/breakingcms/release/13.0.0
  umbraco/Announcements#12 · Filter by author kjac opened on Oct 2, 2023