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Bump Umbraco.Cms from 17.2.2 to 17.4.0#335

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Bump Umbraco.Cms from 17.2.2 to 17.4.0#335
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@dependabot dependabot Bot commented on behalf of github May 21, 2026

Updated Umbraco.Cms from 17.2.2 to 17.4.0.

Release notes

Sourced from Umbraco.Cms's releases.

17.4.0

Upgrade Notes

Be aware of a change to behaviour for detecting the Umbraco application URL. Previously, ApplicationMainUrl was automatically set from the Host header of incoming HTTP requests. In environments where Umbraco is not behind a reverse proxy that validates the Host header, this could allow a forged Host header to overwrite the URL used in password reset links, user invitations, and other email notifications. While this is normally mitigated by proper hosting configuration and setting UmbracoApplicationUrl explicitly, we felt that the auto-detection behaviour should be hardened up and become an opt-in rather than the default. You can read more about this under "Breaking Changes" below, the linked PR and the documentation.

There are a few updates related to performance in this release that are worth investigating for larger sites. Using output cache in your projects, with intelligent and customisable detection of page invalidation, is now a configuration option for templated websites, with extension points also applied for the Delivery API. We have optimised content cache rebuild after schema updates, with an option for deferred rebuild in the background. If considering a project with significant expected concurrency for member login and registration, and you prefer to use an external service for member management, the new option for lightweight external members will be worth reviewing.

If working with AI tools such as Umbraco MCP, additions to management API endpoints that expose JSON schema for data types and allow for patch updates of specific properties, should improve accuracy and reliability.

As usual please find the full list of PRs that have contributed to Umbraco 17.4 as follows.

What's Changed Since 17.4.0-rc3

Full Changelog: umbraco/Umbraco-CMS@release-17.4.0-rc3...release-17.4.0

What's Changed Since 17.4.0-r2

📦 Dependencies

🔒 Security

🐛 Bug Fixes

Full Changelog: umbraco/Umbraco-CMS@release-17.4.0-rc2...release-17.4.0-rc3

What's Changed Since 17.4.0-rc

🐛 Bug Fixes

Full Changelog: umbraco/Umbraco-CMS@release-17.4.0-rc...release-17.4.0-rc2

What's Changed Since the Previous Version (17.3.5)

🙌 Notable Changes

17.4.0-rc3

Upgrade Notes

Be aware of a change to behaviour for detecting the Umbraco application URL. Previously, ApplicationMainUrl was automatically set from the Host header of incoming HTTP requests. In environments where Umbraco is not behind a reverse proxy that validates the Host header, this could allow a forged Host header to overwrite the URL used in password reset links, user invitations, and other email notifications. While this is normally mitigated by proper hosting configuration and setting UmbracoApplicationUrl explicitly, we felt that the auto-detection behaviour should be hardened up and become an opt-in rather than the default. You can read more about this under "Breaking Changes" below, the linked PR and the documentation.

There are a few updates related to performance in this release that are worth investigating for larger sites. Using output cache in your projects, with intelligent and customisable detection of page invalidation, is now a configuration option for templated websites, with extension points also applied for the Delivery API. We have optimised content cache rebuild after schema updates, with an option for deferred rebuild in the background. If considering a project with significant expected concurrency for member login and registration, and you prefer to use an external service for member management, the new option for lightweight external members will be worth reviewing.

If working with AI tools such as Umbraco MCP, additions to management API endpoints that expose JSON schema for data types and allow for patch updates of specific properties, should improve accuracy and reliability.

As usual please find the full list of PRs that have contributed to Umbraco 17.4 as follows.

What's Changed Since 17.4.0-r2

📦 Dependencies

🔒 Security

🐛 Bug Fixes

Full Changelog: umbraco/Umbraco-CMS@release-17.4.0-rc2...release-17.4.0-rc3

What's Changed Since 17.4.0-rc

🐛 Bug Fixes

Full Changelog: umbraco/Umbraco-CMS@release-17.4.0-rc...release-17.4.0-rc2

What's Changed Since the Previous Version (17.3.5)

🙌 Notable Changes

... (truncated)

17.4.0-rc2

Upgrade Notes

Be aware of a change to behaviour for detecting the Umbraco application URL. Previously, ApplicationMainUrl was automatically set from the Host header of incoming HTTP requests. In environments where Umbraco is not behind a reverse proxy that validates the Host header, this could allow a forged Host header to overwrite the URL used in password reset links, user invitations, and other email notifications. While this is normally mitigated by proper hosting configuration and setting UmbracoApplicationUrl explicitly, we felt that the auto-detection behaviour should be hardened up and become an opt-in rather than the default. You can read more about this under "Breaking Changes" below, the linked PR and the documentation.

There are a few updates related to performance in this release that are worth investigating for larger sites. Using output cache in your projects, with intelligent and customisable detection of page invalidation, is now a configuration option for templated websites, with extension points also applied for the Delivery API. We have optimised content cache rebuild after schema updates, with an option for deferred rebuild in the background. If considering a project with significant expected concurrency for member login and registration, and you prefer to use an external service for member management, the new option for lightweight external members will be worth reviewing.

If working with AI tools such as Umbraco MCP, additions to management API endpoints that expose JSON schema for data types and allow for patch updates of specific properties, should improve accuracy and reliability.

As usual please find the full list of PRs that have contributed to Umbraco 17.4 as follows.

What's Changed Since 17.4.0-rc

🐛 Bug Fixes

Full Changelog: umbraco/Umbraco-CMS@release-17.4.0-rc...release-17.4.0-rc2

What's Changed Since the Previous Version (17.3.5)

🙌 Notable Changes

💥 Breaking Changes

📦 Dependencies

🚤 Performance

17.4.0-rc

Upgrade Notes

Be aware of a change to behaviour for detecting the Umbraco application URL. Previously, ApplicationMainUrl was automatically set from the Host header of incoming HTTP requests. In environments where Umbraco is not behind a reverse proxy that validates the Host header, this could allow a forged Host header to overwrite the URL used in password reset links, user invitations, and other email notifications. While this is normally mitigated by proper hosting configuration and setting UmbracoApplicationUrl explicitly, we felt that the auto-detection behaviour should be hardened up and become an opt-in rather than the default. You can read more about this under "Breaking Changes" below, the linked PR and the documentation.

There are a few updates related to performance in this release that are worth investigating for larger sites. Using output cache in your projects, with intelligent and customisable detection of page invalidation, is now a configuration option for templated websites, with extension points also applied for the Delivery API. We have optimised content cache rebuild after schema updates, with an option for deferred rebuild in the background. If considering a project with significant expected concurrency for member login and registration, and you prefer to use an external service for member management, the new option for lightweight external members will be worth reviewing.

If working with AI tools such as Umbraco MCP, additions to management API endpoints that expose JSON schema for data types and allow for patch updates of specific properties, should improve accuracy and reliability.

As usual please find the full list of PRs that have contributed to Umbraco 17.4 as follows.

What's Changed

🙌 Notable Changes

💥 Breaking Changes

📦 Dependencies

🚤 Performance

🌈 Accessibility Improvements

17.3.5

What's Changed

🐛 Bug Fixes

Full Changelog: umbraco/Umbraco-CMS@release-17.3.4...release-17.3.5

17.3.4

What's Changed

🐛 Bug Fixes

Full Changelog: umbraco/Umbraco-CMS@release-17.3.3...release-17.3.4

17.3.3

What's Changed

🐛 Bug Fixes

Full Changelog: umbraco/Umbraco-CMS@release-17.3.2...release-17.3.3

17.3.2

What's Changed

🐛 Bug Fixes

Full Changelog: umbraco/Umbraco-CMS@release-17.3.1...release-17.3.2

17.3.1

What's Changed

🐛 Bug Fixes

Full Changelog: umbraco/Umbraco-CMS@release-17.3.0...release-17.3.1

17.3.0

Upgrade Notes

In 17.3 we have upgraded our dependency on MailKit to 4.15.1. This is a minor version update, but we found a few changes we had to make in core to accommodate changes to nullability constraints. Unless using methods of this library, or it's transitive dependency MimeKit, it's unlikely projects will be affected. The update is necessary though, as the version we previously depended on now has a security vulnerability raised against it.

We have made a change to how we handle redirects which brings a significant performance improvement for publish time on large sites, when documents with many descendent nodes are published. If you have custom URL providers you should review this change, as there are some very rare cases where you'll need to adjust to ensure descendent redirects are correctly handled.

Note also that we now auto-generate HMAC secret key for new installs. This has been applied to make Umbraco more secure by default, but it's not been forced for upgrades.

What's Changed Since 17.3.0-rc3

Full Changelog: umbraco/Umbraco-CMS@release-17.3.0-rc3...release-17.3.0

What's Changed Since 17.3.0-rc2

📦 Dependencies

🐛 Bug Fixes

Full Changelog: umbraco/Umbraco-CMS@release-17.3.0-rc2...release-17.3.0-rc3

What's Changed Since 17.3.0-rc1

🐛 Bug Fixes

Full Changelog: umbraco/Umbraco-CMS@release-17.3.0-rc...release-17.3.0-rc2

What's Changed Since the Previous Version (17.2.2)

🙌 Notable Changes

💥 Breaking Changes

📦 Dependencies

17.3.0-rc3

Upgrade Notes

In 17.3 we have upgraded our dependency on MailKit to 4.15.1. This is a minor version update, but we found a few changes we had to make in core to accommodate changes to nullability constraints. Unless using methods of this library, or it's transitive dependency MimeKit, it's unlikely projects will be affected. The update is necessary though, as the version we previously depended on now has a security vulnerability raised against it.

We have made a change to how we handle redirects which brings a significant performance improvement for publish time on large sites, when documents with many descendent nodes are published. If you have custom URL providers you should review this change, as there are some very rare cases where you'll need to adjust to ensure descendent redirects are correctly handled.

Note also that we now auto-generate HMAC secret key for new installs. This has been applied to make Umbraco more secure by default, but it's not been forced for upgrades.

What's Changed Since 17.3.0-rc2

📦 Dependencies

🐛 Bug Fixes

Full Changelog: umbraco/Umbraco-CMS@release-17.3.0-rc2...release-17.3.0-rc3

What's Changed Since 17.3.0-rc1

🐛 Bug Fixes

Full Changelog: umbraco/Umbraco-CMS@release-17.3.0-rc...release-17.3.0-rc2

What's Changed Since the Previous Version (17.2.2)

🙌 Notable Changes

💥 Breaking Changes

📦 Dependencies

17.3.0-rc2

Upgrade Notes

In 17.3 we have upgraded our dependency on MailKit to 4.15.1. This is a minor version update, but we found a few changes we had to make in core to accommodate changes to nullability constraints. Unless using methods of this library, or it's transitive dependency MimeKit, it's unlikely projects will be affected. The update is necessary though, as the version we previously depended on now has a security vulnerability raised against it.

We have made a change to how we handle redirects which brings a significant performance improvement for publish time on large sites, when documents with many descendent nodes are published. If you have custom URL providers you should review this change, as there are some very rare cases where you'll need to adjust to ensure descendent redirects are correctly handled.

Note also that we now auto-generate HMAC secret key for new installs. This has been applied to make Umbraco more secure by default, but it's not been forced for upgrades.

What's Changed Since 17.3.0-rc1

🐛 Bug Fixes

Full Changelog: umbraco/Umbraco-CMS@release-17.3.0-rc...release-17.3.0-rc2

What's Changed Since the Previous Version (17.2.2)

🙌 Notable Changes

💥 Breaking Changes

📦 Dependencies

🚤 Performance

17.3.0-rc

Upgrade Notes

In 17.3 we have upgraded our dependency on MailKit to 4.15.1. This is a minor version update, but we found a few changes we had to make in core to accommodate changes to nullability constraints. Unless using methods of this library, or it's transitive dependency MimeKit, it's unlikely projects will be affected. The update is necessary though, as the version we previously depended on now has a security vulnerability raised against it.

We have made a change to how we handle redirects which brings a significant performance improvement for publish time on large sites, when documents with many descendent nodes are published. If you have custom URL providers you should review this change, as there are some very rare cases where you'll need to adjust to ensure descendent redirects are correctly handled.

Note also that we now auto-generate HMAC secret key for new installs. This has been applied to make Umbraco more secure by default, but it's not been forced for upgrades.

What's Changed

🙌 Notable Changes

💥 Breaking Changes

📦 Dependencies

🚤 Performance

🌈 Accessibility Improvements

🚀 New Features

... (truncated)

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---
updated-dependencies:
- dependency-name: Umbraco.Cms
  dependency-version: 17.4.0
  dependency-type: direct:production
...

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@dependabot dependabot Bot added .NET Pull requests that update .NET code dependencies Pull requests that update a dependency file labels May 21, 2026
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