> For the complete documentation index, see [llms.txt](https://docs.umbraco.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.umbraco.com/umbraco-cloud/release-notes/overview-2026/2026-08-releasenotes.md). # August 2026 ## Key Takeaways * **Custom error pages shown for stopped environments** - Custom error pages are now also shown while an environment is stopped, not only during restarts and deployments. * **Release Umbraco.Cloud.Cms 13.1.1, 17.2.2, & 18.0.2** - Hides the internal `azurewebsites.net` URL in additional cases. Adds the routes used by Umbraco ID and external login providers to the `ReservedUrls` setting. ## Custom error pages shown for stopped environments Custom error pages assigned through the [Error Pages](/umbraco-cloud/build-and-customize-your-solution/handle-deployments-and-environments/error-pages.md) feature are now also shown while an environment is stopped. When the [Start and stop environments](/umbraco-cloud/release-notes/overview-2026/2026-03-releasenotes.md#start-and-stop-environments) feature was released it did not use the Error Pages feature but instead used a standard platform error page that you could not change. This now ensures you can use a custom error page, matching the behavior during restarts and deployments. This also makes the two features work well together for planned maintenance. Upload a custom maintenance page, assign it to your hostnames, and stop the environment. Visitors then see your maintenance page until you start the environment again. ## Release Umbraco.Cloud.Cms 13.1.1, 17.2.2, & 18.0.2 New versions of the `Umbraco.Cloud.Cms` package are available: 13.1.1, 17.2.2, and 18.0.2. All three versions contain two changes. ### Internal URL hidden in additional cases The internal `azurewebsites.net` URL is now hidden in cases where it could still reach visitors. This follows up on the fix released in 13.1.0, 17.2.1, and 18.0.1. ### Login provider routes added to ReservedUrls The routes used by Umbraco ID and by external login providers are added to the [`ReservedUrls`](https://github.com/umbraco/UmbracoDocs/tree/main/18/umbraco-cms/develop-with-umbraco/configuration/globalsettings.md#reserved-urls) setting. Umbraco leaves these routes alone, so the content request pipeline no longer handles the sign-in callbacks. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.umbraco.com/umbraco-cloud/release-notes/overview-2026/2026-08-releasenotes.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.