2025 Optimizely CMS 12 release notes
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- Optimizely Content Management System (CMS 12)
Note
Are you looking for 2025 CMS (SaaS) release notes?
Or release notes before January 2024 on the Optimizely World site?
You can find prior versions of user guides (2021 and older) and when functionality was released or deprecated at the following locations:
Most recent releases
Date | Release | Type |
|---|---|---|
December 19, 2025 | - CMS Core 12.23.0 | Bug fixes |
December 19, 2025 | - Cloud Platform 1.7.3 | Enhancement and bug fix |
December 18, 2025 | - EPiServer Forms 5.10.6 | Bug fixes |
December 17, 2025 | - Optimizely Reporting Generative Engine Optimization (GEO) Analytics | Enhancement |
December 12, 2025 | - DXP Application Insights API | Enhancement |
December 4, 2025 | - Language Manager 5.5.2 | Bug fix |
November 25, 2025 | - CMS Opal Chat 1.2.0 | Enhancement and bug fix |
November 12, 2025 | - CMS 12.22.10 | Enhancement and bug fixes |
November 6, 2025 | - DXP Added regional support | Enhancement |
November 4, 2025 | - CMS UI 12.34.1 | |
November 4, 2025 | - EPiServer Forms 5.10.5 | Bug fixes |
October 27, 2025 | - Optimizely Forms 1.4.1 | Enhancement and bug fix |
October 27, 2025 | - CMS + CMP 2.1.7 | Enhancement and bug fix |
October 20, 2025 | - DXP Security enhancement | Enhancement |
October 15, 2025 | - CMS Opal Chat 1.1.0 | Enhancements and bug fixes |
October 15, 2025 | - CMS UI 12.34.0 | Enhancements and bug fixes |
October 3, 2025 | - Frontend Hosting for DXP (CMS 12 and Commerce Connect 14) | Enhancement |
September 24, 2025 | - CMS Platform Plus tier for DXP (CMS 12 and Commerce Connect 14) | Enhancements and bug fixes |
September 24, 2025 | - CMS UI 12.33.5 | Enhancements and bug fixes |
September 24, 2025 | - Content Delivery API 3.12.4 | Enhancements and bug fixes |
September 23, 2025 | - Language Manager 5.5.1 | Bug fixes |
September 23, 2025 | - Salesforce Connector for Marketing Automation 4.3.5 | Bug fixes |
September 12, 2025 | - CMS UI 12.33.4 | Bug fixes |
September 11, 2025 | - Optimizely Forms 1.4.0 | Bug Fix |
September 9, 2025 | - CMS Opal Chat 1.0.0 | Enhancement |
September 2, 2025 | - CMS + CMP 2.1.6 | Bug fix |
August 21, 2025 | - Optimizely Forms 1.3.0 | Enhancement |
August 20, 2025 | - CMS Core 12.22.9 | Bug fixes and enhancements |
August 12, 2025 | - TinyMCE 5.0.3 | Bug fix |
August 11, 2025 | - CMS UI 12.33.3 | Bug fix |
July 25, 2025 | - CMS UI 12.33.2 | Bug fixes |
July 16, 2025 | - CMS + CMP 2.1.5 | Enhancement & Bug fix |
July 8, 2025 | - Personalization 2.3.1 | Bug fix |
July 3, 2025 | - Cloud Platform 1.7.2 | Bug fixes |
June 24, 2025 | - CMS Core 12.22.8 | Bug fix |
June 24, 2025 | - Content Delivery API 3.12.3 | Bug fix |
June 17, 2025 | - TinyMCE 5.0.2 | Bug fix |
June 4, 2025 | - CMS UI 12.33.1 | Bug fixes |
May 20, 2025 | - CMS UI 12.33.0 | Bug fixes |
May 13, 2025 | - CMS Core 12.22.7 | Bug fixes |
May 07, 2025 | - TinyMCE 5.0.1 | Bug fix |
April 22, 2025 | - CMS + CMP 2.1.4 | Bug fixes |
April 22, 2025 | Bug fixes | |
April 15, 2025 | - CMS + CMP 2.1.3 | Bug fixes and enhancements |
April 15, 2025 | - CMS Core 12.22.6 | Bug fixes and enhancements |
April 15, 2025 | - CMS UI 12.32.5 | Bug fixes and enhancements |
April 10, 2025 | - DXP HTTP/3 | Enhancement |
April 1, 2025 | - CMS + CMP 2.1.2 | Bug fixes and enhancements |
April 1, 2025 | - TinyMCE 5.0.0 | Bug fixes and enhancements |
March 25, 2025 | - TinyMCE 4.8.3 | Bug fixes |
March 21, 2025 | - Cloud Platform 1.7.1 | Enhancements |
March 18, 2025 | - Language Manager 5.5.0 | Enhancement |
March 11, 2025 | - Content Delivery API 3.12.1 | Bug fixes |
March 4, 2025 | - CMS Core 12.22.5 | Bug fixes |
March 4, 2025 | - EPiServer Forms 4.2.7 | Bug fixes |
February 28, 2025 | - Language Manager 5.4.1 | Bug fixes |
February 26, 2025 | - EPiServer Forms 5.10.4 | Bug fixes |
February 18, 2025 | - Optimizely Forms 1.2.0 | Bug fixes |
February 11, 2025 | - CMS Core 12.22.4 | Bug fixes |
February 11, 2025 | - CMS UI 12.32.4 | Bug fixes |
January 24, 2025 | - Optimizely Forms 1.1.0 | Bug fixes |
January 21, 2025 | - CMS Core 12.22.3 | Enhancements and bug fixes |
January 21, 2025 | - CMS UI 12.32.3 | Enhancements and bug fixes |
January 21, 2025 | - CMS + CMP 2.1.0 | Enhancements and bug fixes |
January 21, 2025 | - CMP client 1.2.0 | Enhancements and bug fixes |
January 21, 2025 | - Content Delivery API 3.12.0 | Enhancements and bug fixes |
January 7, 2025 | - Language Manager 5.4.0 | Bug fixes |
CMS 12
EPiServer.CMS.Core
2025-optimizely-cms-12-release-notes.mdx12.23.0—December 19, 2025
- Bug fixes
- CMS-42164 – Fixed an issue where missing [EPiServerDataIndex] attributes on the SourceLink and ParentLink properties of ParentRestoreEntity in the EPiParentRestoreStore resulted in slow lookups. Adding these attributes significantly improves query performance for the store.
- CMS-46821 – Fixed an issue where InvalidOperationException: Collection was modified errors occurred in ClientResourceService during @Html.RequiredClientResources(RenderingTags.Footer) rendering. This was observed when custom IClientResourceProvider implementations were overriding built-in scripts, indicating a concurrency problem. The ClientResourceService now creates a collection snapshot during iteration, preventing InvalidOperationException in concurrent scenarios and improving stability.
- CMS-46976 – Fixed an issue where a scheduled job that was not set as restartable would remain running after an interruption due to a crash or restart. This incorrectly indicated that the job was still running. The system now uses the LastPing value to detect if the job is no longer active and adds a (Not responding) to the status message on the jobs details page.
- CMS-47341 – Fixed an issue where a SqlNullValueException was thrown when querying for users with a null GivenName. This occurred because the GivenName, Surname, and Email fields in the tblSynchedUser table were not correctly handled as nullable during queries. The system now correctly reads these fields as nullable, preventing the exception.
- CMS-47608 – Fixed an issue where IUrlResolver.GetUrl() returned an unescaped URL when called with a ContentReference parameter, which caused inconsistent URL formats compared to other GetUrl calls. Now, GetUrl calls from UrlResolver and IUrlResolver consistently return escaped URLs.
2025-optimizely-cms-12-release-notes.mdx12.22.10—November 12, 2025
- Enhancement
- Updated public dependencies to enhance security.
- Bug fixes
- CMS-40238 – Fixed a potential memory leak in ContentArea where event handlers were registered but not properly unregistered. This issue could lead to increased memory consumption over time, though there is no indication of a scenario where the memory would not eventually get freed. The correction ensures that event handlers are now correctly managed, removing even the hypothetical risk of a memory leak.
- CMS-40239 – Fixed a potential memory leak in XhtmlString where event handlers were registered but not properly unregistered. This issue could lead to increased memory consumption over time, though there is no indication of a scenario where the memory wouldn’t eventually get freed. The correction ensures that event handlers are now correctly managed, removing even the hypothetical risk of a memory leak.
- CMS-44859 – Fixed a performance bottleneck where each subscriber registration triggered a separate database query to check for notification users. Optimizely reduced the number of calls and made improvements to the stored procedure (netSynchedUserList) used for finding each user.
- CMS-44872 – Fixed the “check for block” usages to enhance performance and optimize execution plans by removing branching on input parameters and handling duplications in the application layer, instead of relying on DISTINCT and UNION in the SQL statement.
- CMS-46455 – Fixed an issue where background tasks were not running in an isolated context, which might have led to conflicts with database contexts and other parallel threads or tasks.
2025-optimizely-cms-12-release-notes.mdx12.22.9—August 20, 2025
- Enhancement
- Added limited retries for undeliverable notifications. Failed notifications are retried for a set number of times and then marked undeliverable if they cannot be sent.
- Added the ability to make preview tokens reusable. Tokens now validate user permissions instead of a specific content reference.
- Bug fixes
- CMS-41404 – Fixed an issue where images embedded in the Rich Text Editor incorrectly had preview tokens appended to their URLs.
- CMS-41854 – Fixed an issue where converting a property to an incompatible type could leave invalid data on content instances, causing pages to fail to load with a cast exception.
- CMS-43245 – Fixed an issue where Cloudflare could cache login redirects or protected media files, potentially blocking access for authenticated users or exposing restricted content. Protected files without public access now include no-cache headers.
- CMS-44365 – Fixed an issue where the netBlockTypeCheckUsage stored procedure performed slowly for certain customers due to inefficient use of TOP 1 and ORDER BY operations.
- CMS-40096 – Fixed an issue where UrlResolver and IUrlResolver returned inconsistently escaped URLs, causing UrlResolver.Route to return null for URLs containing non-ASCII characters.
- CMS-43111 – Fixed an issue where the netMappedIdentityGetById stored procedure did not efficiently use the database index, causing slow performance.
- CMS-43285 – Fixed an issue where URLs with segments starting with http: or other protocols caused a 500 error instead of returning a 404 page.
2025-optimizely-cms-12-release-notes.mdx12.22.8—June 24, 2025
- Bug fix
- CMS-42756 – Fixed an issue where IUrlResolver.GetUrl sometimes generated a relative URL for IContentMedia even when ForceAbsolute is set to true.
2025-optimizely-cms-12-release-notes.mdx12.22.7—May 13, 2025
- Bug fixes
- CMS-40312 – Fixed concurrency issues in HttpRequestCache.
- CMS-40940 – Fixed the issue by improving the performance of the ClientResourceService, specifically optimizing the resource sorting functionality.
2025-optimizely-cms-12-release-notes.mdx12.22.6—April 15, 2025
- Bug fixes
- CMS-37561 – Fixed the issue with the index to exclude NULL values, as the most common value for tblContent.ArchiveContentGUID is NULL, making the existing index ineffective.
- CMS-39486 – Fixed the issue with the setValue method of LazyPropertyValueLoader not providing enough information for troubleshooting.
- CMS-40666 – Fixed a redirect issue that caused the error: InvalidOperationException: Invalid non-ASCII or control character in the header: 0xXXXX'.
2025-optimizely-cms-12-release-notes.mdx12.22.5—March 4, 2025
- Bug fixes
- CMS-37890 – Fixed an issue where audiences and visitor groups were not syncing across all servers.
- CMS-39893 – Fixed an issue that let a user publish a page without filling in a required property in an Ilist.
- CMS-37156 – Fixed an issue where client resources fail to load in the CMS UI when using a redirect hostname.
- CMS-39589 – Fixed an issue with routing not working with a language segment when it should generate URLs without a language segment and work both with and without a language segment.
- CMS-39934 – Registering a custom IConstructorParameterResolver to handle ContentData constructors with one or more parameters will result in a MissingMethodException when instances of the content type are constructed.
2025-optimizely-cms-12-release-notes.mdx12.22.4—February 11, 2025
- Bug fixes
- CMS-39541 – Fixed an issue where changing a property from ContentArea to ContentAreaItem with multiple inline blocks could cause an infinite loading loop and halt site responsiveness.
- CMS-37956 – Fixed an issue where the optimizations for Html.ContentLink() and Url.ContentUrl() methods made it harder to add general URL customizations. The optimizations have been removed.
- CMS-39593 – Fixed an issue where images in the media asset panel were not sorted alphabetically.
2025-optimizely-cms-12-release-notes.mdx12.22.3—January 21, 2025
- Bug fix
- CMS-38813 – Fixed an issue where you could not create an audience when using .NET 9 due to an error occurring for the BinaryFormatter.
EPiServer.CMS.UI
2025-optimizely-cms-12-release-notes.mdx12.34.1—November 4, 2025
- Bug fix
- CMS-45895 – Fixed an issue, that occurred during a Quick Edit operation, that did not display a warning message when a custom IContentEvents.SavingContent event handler returned CancelAction = true with a CancelReason. Now, when using Quick Edit, if a custom SavingContent validation prevents content from being saved, the specified CancelReason message is correctly displayed in the UI.
2025-optimizely-cms-12-release-notes.mdx12.34.0—October 15, 2025
- Enhancements
- Enhanced the Optimizely Graph Search functionality by resolving shared internal identifiers and ensuring that the CMS search provider acts as a fallback, which allows content that was excluded from Graph synchronization to remain discoverable within the CMS UI.
- Bug fixes
- CMS-44226 – Fixed an issue where the Role dropdown list in the Audiences screen was not sorted, improving user experience by ensuring roles are displayed in an organized and easily navigable manner.
- CMS-45382 – Fixed the issue that prevented Time Period criteria creation in Audiences to enable time-based conditions for audience segmentation.
- CMS-45481 – Fixed the item counting issue in the Dashboard when external providers were installed.
- CMS-45648 – Fixed an issue where changes to the LinkItem property were not saved, even when the editor value was modified.
2025-optimizely-cms-12-release-notes.mdx12.33.5—September 24, 2025
- Bug fix
- CMS-45439 – Removed outdated Flash components from the EPiServer.CMS.UI NuGet package. These components, part of a dependency package, were not used or distributed in CMS websites but posed a risk of triggering firewalls or antivirus software during downloads due to Flash being deprecated.
2025-optimizely-cms-12-release-notes.mdx12.33.4—September 12, 2025
- Bug fix
- CMS-44206 – Fixed the issue where the Test Run with Error Log in Export Data did not complete.
2025-optimizely-cms-12-release-notes.mdx12.33.3—August 11, 2025
- Bug fix
- CMS-44217 – Fixed an issue with the incorrect file version of EPiServer.CMS.dll, which could cause problems when restoring the EPiServer.CMS NuGet package as a dependency.
2025-optimizely-cms-12-release-notes.mdx12.33.2—July 25, 2025
- Bug fixes
- CMS-41646 – Fixed an issue affecting the alphabetical sorting of content items (pages, blocks, and media files) with Norwegian characters.
- CMS-43170 – Fixed a issue where the Inline block name was incorrectly HTML-encoded.
- CMS-39582 – Fixed an issue where the edit interface failed to redirect correctly by dynamically setting the EditUrl based on the ProtectedModule configuration when EditUrl was not explicitly defined. A logic update now dynamically sets the EditUrl if it is not explicitly defined.
- CMS-43121 – Fixed the inconsistent saving of values when you selected or deselected multiple audiences.
- CMS-43203 – Fixed an issue where controllers in the Admin shell module did not use System.Text.Json as the default JSON serializer. Now they do.
2025-optimizely-cms-12-release-notes.mdx12.33.1—June 4, 2025
- Bug fixes
- CMS-39673 – Fixed the issue where unhandled exceptions occurred when accessing a Content instance from ContentDataStore could lead to the edit UI remaining in a loading state.
- CMS-41227 – Fixed the iframe issue where is loads for a long time; it is not possible to use the mouse wheel to access the top bar properties.
- CMS-42311 – Fixed a bug where it was not possible to export content items from CMS after changing the global serializer options.
- CMS-42335 – Fixed the issue by adding a way to subscribe to the contentSaved event directly instead of relying on a global window.epi object.
2025-optimizely-cms-12-release-notes.mdx12.33.0—May 20, 2025
- Bug fixes
- CMS-41169 – Fixed the issue of inconsistent behavior in selecting the personalization pop-up.
- CMS-41849 – Fixed the issue where the user cannot compare versions of a page.
- CMS-41862 – Fixed the issue for pagination is not working for Link Validation.
2025-optimizely-cms-12-release-notes.mdx12.32.5—April 15, 2025
- Enhancements
- Improved export screen in admin mode to work more reliably when exporting very big data chunks.
- Improved the import data view in the Settings to prevent potential timeout issues when importing large files or when the import HTTP request lasts an extended duration.
- Improved error messages for file uploads will inform users about the source of the error.
- Bug fixes
- CMS-39707 – Fixed an issue where the select image button does not work.
- CMS-32843 – Fixed an issue where the editor got a bad request from /activity/ controller when selecting multiple project items.
- CMS-33725 – Fixed an issue where uploading a file larger than UploadOptions.FileSizeLimit in an instance on DXP results in an HTTP status of 405 (Method not allowed) instead of the intended 413 (Content too large).
- CMS-40071 – Fixed an issue where the SaaS CMS could not drag and drop content blocks into the content area if the display name contained spaces.
- CMS-40012 – Fixed an issue when the focus was lost after editing an inline-block.
- CMS-40101 – Fixed an issue where the Catalog entry search from the Assets panel takes a much longer time compared to the left on Navigation panels.
2025-optimizely-cms-12-release-notes.mdx12.32.4—February 11, 2025
- Bug fixes
- CMS-37958 – Fixed an issue where personalization groups incorrectly let you configure the same audience for multiple variants or fragments, even though only single variants of fragments were allowed.
- CMS-39324 – Fixed an issue where the quick navigator rendered only for the default authentication scheme (instead of the specified authentication scheme) when you used mixed-mode authentication.
- CMS-39103 – Fixed an issue that did not restrict file types for upload. Now the Import Data function allows uploads of only files with the .episerverdata extension.
- CMS-38847 – Fixed an issue that let a user publish a page without filling in a required property in an Ilist. (You should be able to save the content that contains a list of blocks with some required values missing but you should not be able to publish it.)
2025-optimizely-cms-12-release-notes.mdx12.32.3—January 21, 2025
- Bug fixes
- CMS-37388 – Fixed an issue that did not display a pop-up window when you selected an image in the ImageRef property.
- CMS-35323 – Fixed an issue that caused a blank screen in CMS edit. This happened in some rare conditions when shared resources could not be parsed on time, or dojo.getObject caused the exception multipleDefine that led to an exception in other places that tried to access epi.resources.action.
- CMS-35654 – Fixed an issue in the date that displayed incorrectly when you used scheduled publishing.
- CMS-37919 – Fixed an issue in subcategories that included &nbps; instead of a space when you created an audience with a Site Criteria on Visited category.
- CMS-38508 – Fixed an issue where errors were logged because not all schemas can handle sign out. If you did not use OptimizelyIdentity or CmsAspNetIdentity, there was no registered implementation of EPiServer.Shell.Security.UISignInManager. In this scenario, when logging out from CMS UI, you should only call SignOutAsync on the default schema.
EPiServer.ImageLibrary.ImageSharp
2025-optimizely-cms-12-release-notes.mdx2.0.5—April 22, 2025
- Bug fix
- CMS-37774 – Fixed an issue where it was not possible to crop a large image while zooming out to see the whole image.
- CMS-41356 – Fixed the vulnerability in SixLabors.ImageSharp 3.1.5.
2025-optimizely-cms-12-release-notes.mdx1.0.4—April 22, 2025
- Bug fix
- CMS-37774 – Fixed an issue where it was not possible to crop a large image while zooming out to see the whole image.
- CMS-41358 – Fixed the vulnerability in SixLabors.ImageSharp 2.1.9.
Optimizely.Cms.OpalChat
2025-optimizely-cms-12-release-notes.mdx1.2.0—November 26, 2025
- Enhancement
- Added CMS context support and infrastructure enhancements to OpalChat for CMS 12, including automatic context passing and improved event-driven behavior. See Optimizely Opal Chat for CMS 12.
- Bug fix
- CMS-46768 – Fixed TagHelperComponent registration issue that prevented OpalChat scripts from loading when other components were registered first.
2025-optimizely-cms-12-release-notes.mdx1.1.0—October 15, 2025
- Enhancement
- Optimizely Opal Chat is generally available to research, brainstorm, and edit content. See Optimizely Opal Chat for CMS 12.
2025-optimizely-cms-12-release-notes.mdx1.0.0—September 9, 2025
- Enhancement
- (Beta) Use Optimizely Opal Chat to research, brainstorm, and edit content. See Optimizely Opal Chat for CMS 12.
CMS Cloud Platform
EPiServer.CloudPlatform.Cms
2025-optimizely-cms-12-release-notes.mdx1.7.3—December 19, 2025
- Enhancement
- Added updated Azure DataProtection SDK dependencies in Cloudplatform to mitigate a performance issue that could cause ThreadPool starvation.
- Bug fix
- CMS-44283 – Fixed an issue where Cloudplatform packages 1.7.2 were not strong-name signed. This release includes properly strong-name–signed assemblies.
2025-optimizely-cms-12-release-notes.mdx1.7.2—July 3, 2025
- Bug fixes
- CMS-40733 – Fixed the issue where CloudPlatform health check should not use ISchemaUpdater.
- CMS-42528 – Fixed an issue by skipping the processing of database queries to epicms and epicommerce that happened frequently and consumed large amounts of Log Analytics.
2025-optimizely-cms-12-release-notes.mdx1.7.1—March 21, 2025
- Enhancements
- CloudPlatform now supports using connection string to configure the application insights tracking script.
Note
The Instrumentation key will be unsupported from 31 March 2025.
- Updated the following CloudPlatform dependencies to void a known issue with Microsoft packages. See [DataProtection] Hang at application start when trying to get DataProtection key from Azure KeyVault #53989.
- Azure.Extensions.AspNetCore.DataProtection.Blobs 1.3.3
- Azure.Extensions.AspNetCore.DataProtection.Keys 1.2.3
CMS + CMP
EPiServer.Cms.WelcomeIntegration
2025-optimizely-cms-12-release-notes.mdx2.1.7—October 27, 2025
- Bug fix
- CMS-46207 – Fixed an issue where you could not update or replace an asset from the Digital Asset Management (DAM) when using the single LinkItem property on a page or block. Previously, attempting to edit a link opened the DAM pop-up instead of the expected Edit Link window, and errors occurred when trying to add a link after removing the old one. This behavior was inconsistent with the LinkItemCollection property, which functioned correctly. Now, editing a single LinkItem opens the Edit Link window, allowing seamless asset updates.
2025-optimizely-cms-12-release-notes.mdx2.1.6—September 2, 2025
- Bug fix
- CMS-44290 – Fixed an issue where DAM asset maintenance job failed when the asset metadata was malformed.
2025-optimizely-cms-12-release-notes.mdx2.1.5—July 16, 2025
- Enhancement
- Updated the CMS 12 HtmlHelper and TagHelper for DAM assets to correctly render alt text for both images and their renditions when assets are served from Graph. The metadata service now detects rendition-based requests and resolves metadata from the original image, ensuring all rendition properties are populated correctly and improving accessibility for Graph-indexed DAM assets.
- Bug fixes
- CMS-42876 – Fixed an issue where clicking an image did not open it in Optimizely DAM if content reference properties had UIHint set to Image.
- CMS-42759 – Fixed an issue where the DAM metadata maintenance job may run too fast for the CMP API threshold of 10 requests per second.
- CMS-42582 – Fixed a CMS installation issue with Commerce: a scheduled asset tracking job fails with a Unexpected metadata type argument error if metadata is missing. Non-Commerce installations are unaffected.
- CMS-42853 –Fixed an issue where DAM image metadata wasn't retrieved during page or block publishing.
2025-optimizely-cms-12-release-notes.mdx2.1.4—April 22, 2025
- Bug fixes
- CMS-41339 – Fixed an issue where the DAM metadata maintenance job may run too fast for the CMP API threshold of 10 requests per second.
- CMS-41132 – Fixed an issue when attempting to add some assets from DAM to an IList. An error states, You do not have access rights to publish this content.
2025-optimizely-cms-12-release-notes.mdx2.1.3—April 15, 2025
- Bug fixes
- CMS-40931 – Fixed the threading issue in DAM integration.
- CMS-41129 – Fixed the issue of DAM maintenance job for the graph ending early.
2.1.2—April 1, 2025
- Bug Fixes
- Fixed an issue in the CMP metadata maintenance scheduled job that failed when trying to remove assets. The scheduled job, CMP asset metadata maintenance, divided the used assets into chunks while retrieving metadata from the DAM. When one image used in CMS was removed in CMP, that chunk failed to update. If the asset was properly tracked, then CMP would also give the option to cancel the removal with a warning that the image was in use, and where, prior to deleting it. This affected only installations using the REST API integration and not the Graph integration. See CMP DAM in CMS for information about Optimizely Graph integration.
- Fixed an issue that opened CMS assets incorrectly when you replaced DAM assets on ContentReference properties. ContentReference properties that did not specify UIHint opened the CMS content tree even if DAM assets were currently referenced. You can workaround this by removing the reference and choosing a new one instead of replacing it.
- Fixed an issue where duplicate references to DAM caused a malfunction in the scheduled job for maintaining metadata that has been resolved.
2025-optimizely-cms-12-release-notes.mdx2.1.0—January 21, 2025
- Enhancement
- Reduced the number of requests performed against the CMP DAM API to increase performance in retrieving metadata for referenced assets.
- Bug fixes
- CMS-38213 – Fixed an issue that caused a scheduled job failure when neither the CMP API nor Optimizely Graph was integrated and configured. Logs contained errors that indicated CMP integration was not configured: Client Id and Client Secret are required in CmpClientOptions. See CMP DAM in CMS.
- CMS-38272 – Fixed an issue that caused the graph query to fail when CMS was configured to index content into Optimizely Graph and CMP DAM assets were also being retrieved from Optimizely Graph. Workaround: Configure the OptiGraphOptions.TransformActionBehaviour option and set it to Clone to let CMS use two different sources in Optimizely Graph. Note that DAM and CMS have their own SingleKey used to query Optimizely Graph.
Cmp.Client
2025-optimizely-cms-12-release-notes.mdx1.2.0—January 21, 2025
- Enhancement
- Added ICmpClient EnsureConfiguration to validate the configuration without calling actual endpoints.
Content Delivery API
EPiServer.ContentDeliveryApi
2025-optimizely-cms-12-release-notes.mdx3.12.4—September 24, 2025
- Bug fix
- HAPI-2917 – Fixed an issue where serialization of XHTML strings could throw an exception with the message "Value cannot be null. (Parameter 'provider')" during index operations for certain content IDs. Although the issue could not be consistently reproduced, safeguard checks were implemented to prevent this error in the future.
2025-optimizely-cms-12-release-notes.mdx3.12.3—June 24, 2025
- Bug fix
- HAPI-2907 – Fixed an issue where the content in an XHTML string sometimes contained incorrect information or was empty after indexing when MaxDegreeOfParallelism was set to greater than 1.
2025-optimizely-cms-12-release-notes.mdx3.12.1—March 11, 2025
- Bug fixes
- HAPI-2871 – Fixed an issue where users can still access content even if it does not match the RequiredRole.
- HAPI-2878 – Resolved an issue where EPiServer.ContentManagementApi version 3.11.0 could not find the service for IContentApiRequiredRoleFilter.
- HAPI-2831 – Fixed an issue where the ContentDeliveryApiOptions.RequiredRole setting did not take effect when the ContentSearchApiOptions.RequiredRole was configured.
- HAPI-2880 – Fixed an issue that caused an exception in the ExpandedContentPropertyModel.ExpandProperty method.
2025-optimizely-cms-12-release-notes.mdx3.12.0—January 21, 2025
- Enhancement
- Added support for the ContentAreaItem property. You can GET, CREATE, UPDATE, and PATCH the ContentAreaItem property through Content Management API.
- Bug fix
- HAPI-2846 – Fixed an issue in ErrorsStartupFilter that redirected 4nn responses to the corresponding view /Util/Errors/Error4xx. This caused a problem when the partner challenged a 401 response, the filter caught it and redirected it to the Error401 view (which does not even exist) and other weird behavior.
Optimizely Forms
Optimizely.CMS.Forms.*
2025-optimizely-cms-12-release-notes.mdx1.4.1—October 27, 2025
- Enhancement
- Added an Optimizely Graph indexing enhancement that honors Boolean type settings to ensure accurate type mapping and improved interoperability with GraphQL. You can now query bool properties using the standard GraphQL Boolean type. Previously, C# bool properties were converted to a custom Bool type, which limited compatibility with GraphQL's default Boolean type. This enhancement improves interoperability with GraphQL standards and simplifies the querying process for bool properties, eliminating the need for additional configuration.
2025-optimizely-cms-12-release-notes.mdx1.4.0—September 11, 2025
- Bug fix
- AFORM-4690 – Fixed an issue where the indexing job failed when using Optimizely.ContentGraph.Cms version 4.x.x or higher.
2025-optimizely-cms-12-release-notes.mdx1.3.0—August 21, 2025
- Enhancement
- Added support for PreventFieldCollision in Forms to prevent conflicts if different content types use the same field name with different data types (such as DataSource$$string and DataSource$$int) when indexing data in Optimizely Graph. When you set PreventFieldCollision to true, field names are stored in Optimizely Graph with their data type. This ensures more reliable data storage and querying, while maintaining backward compatibility when PreventFieldCollision is disabled.
2025-optimizely-cms-12-release-notes.mdx1.2.0—February 18, 2025
- Bug fix
- AFORM-4594 – Fixed a compatibility issue between Optimizely.ContentGraph.Cms 3.14.3 and Optimizely.Cms.Forms.ContentGraph 1.1.0.
2025-optimizely-cms-12-release-notes.mdx1.1.0—January 24, 2025
- Bug fixes
- AFORM-4550 – Fixed an issue with custom element types that inherit from SelectionElementBlock so they will work with the feed provider.
- AFORM-4300 – Fixed an issue that had the wrong access right for the submission API, causing an error: 403 Forbidden with detail: Unable to view form submission with key submissionKey, associated with the form key.
- AFORM-4234 – Fixed an issue on a form where SubmissionKey is not a submission key, which returned an error (500) instead of the expected 400.
- AFORM-3907 – Fixed an issue that caused an error (500) when the system tried to redirect to an image after form submission.
- AFORM-4254 – Fixed an issue with Get default language that was missing the submitSuccessMessage.
EPiServer.Forms.*
2025-optimizely-cms-12-release-notes.mdx5.10.6—December 18, 2025
- Bug fixes
- AFORM-4084 – Fixed an issue where anonymous form submissions would result in a generic "500 Internal Server Error" if you had logged into the application in another browser tab. You will now receive a more user-friendly error message when an anti-forgery token is incorrect, preventing repeated failed submissions and improving your overall experience.
- AFORM-4650 – Fixed an issue where the version in Razor views, such as ParagraphTextElementBlock, was not updated after code changes. Going forward, ensure that the version is updated accordingly whenever you make code changes in these files.
- AFORM-4693 – Fixed an issue where an exception could occur during email submission if placeholder values were null. Optimizely added null checking to prevent this, ensuring that you can now send emails after submission without encountering unexpected errors, submissions without encountering unexpected exceptions.
2025-optimizely-cms-12-release-notes.mdx5.10.5—November 4, 2025
- Bug fixes
- AFORM-4672 – Fixed an issue where copying forms with deleted dependencies resulted in an "Object reference not set" error; the copy action now proceeds, and a warning is logged for deleted dependencies.
- AFORM-4689 – Fixed the issue where forms with a Number element configured for Integer or Positive Integer validators were submitted successfully when an invalid number (such as a period or NumpadDecimal) was entered, instead of displaying an "invalid number" message.
2025-optimizely-cms-12-release-notes.mdx4.2.7—March 4, 2025
- Bug fix
- AFORM-4513 – Fixed an issue where the DatePicker in Forms.Sample displayed the incorrect date format.
2025-optimizely-cms-12-release-notes.mdx5.10.4—February 26, 2025
- Bug fix
- AFORM-4601 – Fixed an issue that occurred when renaming the form element if the email template was empty.
Optimizely Language Manager
EPiServer.Labs.LanguageManager
2025-optimizely-cms-12-release-notes.mdx5.5.2—December 4, 2025
- Bug fix
- Fixed the issue where the Azure AI Translator Service rate limits were exceeded, causing the API to block access. The process now halts immediately if a translation error occurs, preventing the assignment of the cognitive_service_translation_error value to translatable properties.
2025-optimizely-cms-12-release-notes.mdx5.5.1—September 23, 2025
- Bug fix
- LM-702 – Fixed an issue that failed to import a translation package due to a corrupted uploaded package error.
2025-optimizely-cms-12-release-notes.mdx5.5.0—March 18, 2025
- Enhancement
- Added support for local blocks in import or export Xliff documents. When you export to Xliff from a content that contains a BlockProperty, Language Manager supports one level of BlockProperty with no limit of inline block levels. For example:
- Page
- BlockProperty
- ContentArea
- InlineBlock 1
- InlineBlock 2
- ContentArea
- InlineBlock 2-1
- InlineBlock 2-2
2025-optimizely-cms-12-release-notes.mdx5.4.1—February 27, 2025
- Enhancement
- Added support for inline blocks to be translated when you import the Xliff content that contains inline blocks.
2025-optimizely-cms-12-release-notes.mdx5.4.0—January 7, 2025
- Enhancements
- Extended auto-translation capabilities to LinkItem and LinkItemCollection properties.
- Extended auto-translation capabilities to inline blocks.
- Bug fixes
- LM-615 – Fixed an issue to translate special characters in URLs. Use UrlSegmentOptions.ValidCharacters for a set of valid characters. Otherwise, only alphabetic characters, hyphens (-), and underscores (_) are accepted.
- LM-508 – Fixed an issue where you exported a null JSON translation package file if the content contained an inline block.
- LM-507 – Fixed an issue where you exported a null JSON translation package file if the content contained an inline block inside a content area.
- LM-503 – Fixed an issue in IList<T> that duplicated or translated an inline block improperly.
Marketing Automation
Salesforce
EPiServer.MarketingAutomationIntegration.Salesforce
2025-optimizely-cms-12-release-notes.mdx4.3.5 (CMS 11)—September 23, 2025
- Bug fixes
- MAI-2232 (CMS 11) – Fixed an issue in the Salesforce Connector where expired credentials could lead to an infinite retry loop, potentially causing site instability. Retry attempts are now limited to a maximum of three.
TinyMCE
EPiServer.CMS.TinyMce
2025-optimizely-cms-12-release-notes.mdx5.0.3—August 12, 2025
- Bug fix
- CMS-39735 – Fixed an issue where switching between editing a local block and a global block in the Rich Text Editor could cause the global block to load in Quick Edit mode with data from the previously edited local block.
2025-optimizely-cms-12-release-notes.mdx5.0.2—June 17, 2025
- Bug fix
- CMS-39848 – Fixed an issue where dragging and dropping pages from the recent gadget into XhtmlString properties using TinyMCE did not work.
2025-optimizely-cms-12-release-notes.mdx5.0.1—May 7, 2025
- Bug fix
- CMS-41834 – Fixed an incorrect initialization of Optimizely's commercial license key for TinyMCE.
2025-optimizely-cms-12-release-notes.mdx5.0.0—April 1, 2025
- Enhancement
- Upgraded TinyMCE to version 7. See also Migrating from TinyMCE 6 to TinyMCE 7. See also blog post by Grzegorz Wiechec: TinyMCE 7 editor upgrade.
2025-optimizely-cms-12-release-notes.mdx4.8.3—March 25, 2025
- Bug fixes
- CMS-39004 – Fixed an issue where the Global menu displayed above the TinyMCE toolbar.
- CMS-39467 – Fixed minor bugs by updating TinyMCE to version 6.8.5.
- CMS-39055 – Fixed an issue where the Spellchecker service returned an error from AutoValidateAntiforgeryTokenAttribute.
Personalization
July 8, 2025
- Bug fix
- Fixed an issue where MaxMindGeolocationProvider did not resolve IP address to a geolocation result.
DXP
2025-optimizely-cms-12-release-notes.mdxDecember 12, 2025
- Enhancement
- Take control of your team's access to Application Insights data directly through the PaaS Portal. A new self-service interface under the API tab lets you generate secrets for accessing Application Insights data without needing to contact Optimizely Support. This enhancement reflects a transition to a new, more efficient method for managing credentials, driven by changes in Microsoft's Application Insights authentication process. See Access Application Insights API to query telemetryAccess Application Insights API to query telemetry.
2025-optimizely-cms-12-release-notes.mdxNovember 6, 2025
- Enhancement
- Added support for the South Central US region (San Antonia, TX) for CMS (SaaS) and CMS 12 (PaaS) hosting. See the Optimizely Service Description for supported regions.
2025-optimizely-cms-12-release-notes.mdxOctober 20, 2025
- Security enhancement
- Deployed a system update to address a recently identified security vulnerability in ASP.NET Core. If you notice a deployment from that date in your PaaS Portal account, it is part of this proactive patch to ensure our platform remains secure and up to date. See Microsoft Security Advisory CVE-2025-55315: .NET Security Feature Bypass Vulnerability #64033 . No action is needed.
October 3, 2025
- 2025-optimizely-cms-12-release-notes.mdxEnhancement
- Added front-end hosting to make Optimizely your all-in-one solution for managing both your frontend and CMS 12 in one platform. See Host a frontend with OptimizelyHost a frontend with Optimizely.
- Deploy your front end in minutes
- Easy-to-use deployment interface
- Fully-managed infrastructure, including CDN & WAF
September 24, 2025
- 2025-optimizely-cms-12-release-notes.mdxEnhancement
- CMS Platform Plus (for CMS 12 PaaS and Commerce Connect 14) is an optional paid app (add-on) for businesses that value high availability, security, and performance, especially for businesses that run mission-critical applications such as banks, hospitals, or commerce businesses, where any service interruption or slowness is not acceptable. CMS Platform Plus includes:
- Premium service bus – Higher performance, especially with frequent high-traffic campaigns.
- Automatic failover – Region-level availability.
- Zone redundancy – Zone-level availability.
- Guaranteed 99.9% SLA
See CMS Platform Plus tierCMS Platform Plus tier for information.
April 10, 2025
- 2025-optimizely-cms-12-release-notes.mdxEnhancement
- DXP now supports the HTTP/3 protocol, which is the latest version of the HTTP protocol used for transferring data on the web. The HTTP/3 protocol entails:
- Improved Performance – HTTP/3 is built on the QUIC transport protocol, which is designed to reduce latency and improve the speed of web connections, especially on unreliable networks.
- Enhanced Security – HTTP/3 incorporates encryption as a fundamental part of the protocol, thereby enhancing the security of data in transit without requiring additional layers.
- Better user experience – By enabling HTTP/3, websites can offer faster page loads and smoother interactions, leading to a better overall user experience.
Optimizely Reporting
2025-optimizely-cms-12-release-notes.mdxDecember 17, 2025
- Enhancement
- Added the Generative Engine Optimization (GEO) Analytics dashboard in Optimizely Reporting to view AI platform traffic and optimize your site’s performance. Using the data from GEO Analytics, you can track AI traffic trends, identify frequent AI agents, and discover popular webpages among AI platforms. This lets you refine your content for AI optimization and leverage high-performing pages to improve overall engagement. See GEO Analytics for CMS (PaaS) – Support Help Center.