Version 4 supported
This version of Silverstripe CMS is still supported though will not receive any additional features. Go to documentation for the most recent stable version.

Release process

This page describes the process followed for "core" releases (the modules included by silverstripe/recipe-core and silverstripe/recipe-cms).

Release planning

The Silverstripe CMS core team uses an Agile methodology. We aim to keep the latest development branches of each module in a "potentially releasable" state. Releases are planned around an issue backlog according to our roadmap. We re-revaluate our priorities every few weeks.

Silverstripe CMS is split up into many modules listed in the Silverstripe GitHub organisation. Each may have a different release line (e.g. 1.x vs. 4.x). There are high-level "recipe" milestones on the framework repository to combine individual module milestones into a larger release that's eventually available to install with composer.

New features and API changes are discussed as GitHub issues), as well as the forum. They are prioritised by the core team as tickets on GitHub. In addition, we collect community feedback as feature ideas on the forum. Any feature ideas we're planning to implement will be flagged there.

Keeping track

Release dates are usually not published prior to the release, but you can get a good idea of the release status by reviewing the release milestone on GitHub. Releases will be announced on the "releases" forum category. Significant releases will also be published via the blog.

You can also keep track of new releases through the CMS UI by installing the maintenance module, or using the composer outdated command in your project.

Additionally, you can keep track of issues (both open and closed) across all modules involved in a recipe release.

Release numbering

Silverstripe CMS follows Semantic Versioning.

All Silverstripe CMS modules (including silverstripe/framework) may have patch releases created at any time, and will not necessarily match other core module patch release numbers. For example, your project may be using silverstripe/cms 4.3.1 with silverstripe/versioned 4.3.9.

All Silverstripe CMS recipes are released in lock step with each other. For example, silverstripe/installer 4.3.1 will contain silverstripe/recipe-cms 4.3.1 and silverstripe/recipe-core 4.3.1. These recipes may contain various patch versions of its modules within the same minor release line (4.3 in this example).

Regular minor releases

Regular minor releases are preceded by pre-stable releases to help lay the groundwork for the stable release.

See our minor release policy for details about our release cadence.

Beta phase

At the start of the Beta phase:

  • new minor branches for core modules are forked from the major branches
  • a feature freeze is instituted on the minor branches
  • a beta1 release is tagged for recipes and related modules.

The length of the beta phase period will be communicated at the time it is tagged via the Silverstripe Forum. While the beta phase lasts additional betas may be released to address critical issues holding back testers.

"Beta release" definition

The purpose of a beta release is to initiate a "Feature Freeze" to stabilise the Silverstripe CMS codebase for an upcoming stable release and showcase new features. A beta release is likely to contain regressions and new bugs. A beta release is primarily aimed at testers who want to help identify bugs and regressions.

"Feature freeze" definition

A "Feature freeze" is a pre-release minor branch state. This state allows the core team to stabilise the upcoming release and reach production quality.

The following type of changes can be merged in a branch in feature freeze:

  • bug fixes, regardless of severity
  • API changes if they fix a bug and are compliant with our existing semver commitments
  • merge-ups from older minor branches (introducing bug fixes).

The following changes cannot be merged in a branch in feature freeze:

  • anything that introduces new features
  • API changes not targeted to fixing a bug, or that alter an existing API in a stable release.

Release candidate phase

All critical or high priority issues in the beta release should have been identified and fixed by the start of the Release Candidate phase.

At the start of the Release Candidate phase:

  • a publicly visible rc1 release is tagged for recipes and related modules
  • a private Release Candidate is created containing fixes for undisclosed vulnerabilities on top of the rc1 release
  • the private Release Candidate is delivered to independent auditors for a security review.

The Release Candidate phase lasts approximately two weeks. Additional patches may be added to the final release only if:

  • vulnerabilities are discovered by the security audit
  • additional critical issues are identified.

"Release Candidate" definition

A release candidate will not introduce any new features compared to its preceding beta release. The Silverstripe CMS core team is confident a release candidate is production quality and does not introduce new regressions.

The purpose of a release candidate is to allow module maintainers and project owners to audit the upcoming release and confidently plan their upgrades.

Only critical bug fixes can be added to the upcoming stable release once the release candidate is released.

Stable phase

A new stable minor release is tagged for Silverstripe CMS core recipes. This marks the start of our official semver commitment for any new APIs introduced in that minor release.

Supported versions

At any point in time, the core development team will support a set of releases to varying levels. The current support status is outlined on the roadmap.

See the minor release policy and major release policy for more information.


Needs of developers (both on core framework and custom projects) can outgrow the capabilities of a certain API. Existing APIs might turn out to be hard to understand, maintain, test or stabilise. In these cases, it is best practice to "refactor" these APIs into something more useful. The Silverstripe CMS team acknowledges that developers have built a lot of code on top of existing APIs, so we strive for giving ample warning on any upcoming changes through a "deprecation cycle".

Deprecating API

  • Add a @deprecated item to the docblock tag, with a {@link <class>} item pointing to the new API to use.
  • Update the deprecated code to throw a Deprecation::notice() error.
  • Deprecations should not be committed to patch releases
  • Both the docblock and error message should contain the version where the functionality is deprecated from. So, if you're committing the change to a 4.12 minor release, the target version will be 4.12.0.
  • Deprecations should only be committed to pre-release branches, ideally before they enter the "beta" phase. If deprecations are introduced after this point, their target version needs to be increased by one.
  • Make sure that the old deprecated function works by calling the new function - don't have duplicated code!
  • The commit message should contain an API prefix (see "commit message format")
  • Document the change in the changelog for the next release
  • Deprecated APIs can be removed only after developers have had sufficient time to react to the changes. Hence, deprecated APIs should be removed in MAJOR releases only. Between MAJOR releases, leave the code in place with a deprecation warning.
  • Exceptions to the deprecation cycle are APIs that have been moved into their own module, and continue to work with the new minor release. These changes can be performed in a single minor release without a deprecation period.

When deprecating a method:

  • Add the following docblock @deprecated 1.2.3 Use anotherMethod() instead
  • Deprecation::notice('1.2.3', 'Use anotherMethod() instead'); to the top of the method

When deprecating a class:

  • Add the following docblock @deprecated 1.2.3 Use AnotherClass instead
  • Add Deprecation::notice('1.2.3', 'Use AnotherClass instead', Deprecation::SCOPE_CLASS); to the top of __construct()

When deprecating config:

  • Add the following docblock @deprecated 1.2.3 Use different_config instead

When deprecating some behaviour or combination of configuration values:

  • Add Deprecation::notice('1.2.3', 'Using x with y is deprecated. Do [other thing] instead', Deprecation::SCOPE_GLOBAL);
  • It may not be immediately clear where this type of deprecation notice should go. In that case, add it to the HTTPApplication::warnAboutDeprecatedSetups() method.
  • It may be appropriate to link to some documentation in the message for this type of deprecation notice.

If there is no immediate replacement for deprecated code that is being called, either because the replacement is not available until the next major version, or because there is not a plan for there to be a replacement, the message should be "Will be removed without equivalent functionality to replace it."

Avoiding deprecated API

Wherever possible, once some API has been deprecated, we should stop using it. This allows projects to emit deprecation notices and have an accurate list of code that they need to change.

In some cases, we may not yet have a replacement for code that is required for the current major - but that we still have to call and support internally. In these cases, since we can't stop calling the code, wrap the call to the deprecated code in Deprecation::withNoReplacement() e.g:

use SilverStripe\Dev\Deprecation;

// ...

// The $myVariable variable will get the result of the call to $obj->myDeprecatedMethod()
$myVariable = Deprecation::withNoReplacement(function () {
    return $obj->myDeprecatedMethod();

For any unit tests using the deprecated method/class/config, add the following the the top of the unit test. This ensures that deprecated code is still supported as usual when Deprecation notices are not enabled, though the tests are skipped whenever you are testing to see if deprecated code is still be called.

namespace SilverStripe\Test;

use SilverStripe\Dev\Deprecation;
use SilverStripe\Dev\SapphireTest;

class MyTest extends SapphireTest
    public function testSomething()
        if (Deprecation::isEnabled()) {
            $this->markTestSkipped('Test calls deprecated code');
        // ...

Here's an example for replacing Director::isDev() with a (theoretical) Env::is_dev():

namespace SilverStripe\Control;

use SilverStripe\Dev\Deprecation;
// ...

class Director
    // ...

     * Returns true if your are in development mode
     * @deprecated 4.12.0 Use Env::is_dev() instead.
    public function isDev()
        Deprecation::notice('4.12.0', 'Use Env::is_dev() instead');
        return Env::is_dev();

This change could be committed to a minor release like 4.12.0, and remains deprecated in all subsequent minor releases (e.g. 4.13.0), until a new major release (e.g. 5.0.0), at which point it gets removed from the codebase.

Enabling deprecation notices

Deprecation notices aren't enabled by default. They can be turned on for dev environments with one of the following methods:


// app/_config.php
use SilverStripe\Dev\Deprecation;


To test that deprecated code is no longer being called, run code via CI in an installer/kitchen-sink project that has deprecations enabled. Then view the CI output in the "Run tests" of the GitHub actions CI job and/or view the contents of silverstripe.log in the GitHub actions CI artifact to see if there are deprecation warnings. There should be zero deprecation warnings.

Security releases

A security release is a Silverstripe CMS Core Release with patches for one or more security issues.

Reporting an issue

Report security issues in our commercially supported modules to Please don't file security issues in our bugtracker.

Silverstripe CMS does not operate a bug bounty program.

Acknowledgment and disclosure

In the event of a confirmed vulnerability in our supported modules, we will take the following actions:

  • Acknowledge to the reporter that we've received the report and that a fix is forthcoming. We'll give a rough timeline and ask the reporter to keep the issue confidential until we announce it.
  • Assign a CVE identifier to the issue.
  • For "high" and "critical" issues (CVSS of >=7.0): Pre-announce the upcoming security release to a private pre-announcement mailing list of important stakeholders (see below).
  • We will inform you about resolution and announce a new release publicly.

You can help us determine the problem and speed up responses by providing us with more information on how to reproduce the issue:

  • Silverstripe CMS version (incl. any installed modules)
  • PHP/webserver version and configuration
  • anonymised webserver access logs (if a hack is suspected)
  • any other services and web packages running on the same server.

Severity rating

Each security release includes an overall severity rating and one for each vulnerability. The rating indicates how important an update is. It follows the Common Vulnerability Scoring System (CVSS). This rating determines which release lines are targeted with security fixes.

Critical9.0 to 10.0Critical releases require immediate action. Such vulnerabilities allow attackers to take control of your site and you should upgrade on the day of release. Example: Directory traversal, privilege escalation
High7.0 to 8.9Important releases should be evaluated immediately. These issues allow an attacker to compromise a site's data and should be fixed within days. Example: SQL injection.
Medium4.0 to 6.9Releases of moderate severity should be applied as soon as possible. They allow the unauthorized editing or creation of content. Examples: Cross Site Scripting (XSS) in template helpers.
Low0.1 to 3.9Low risk releases fix information disclosure and read-only privilege escalation vulnerabilities. These updates should also be applied as soon as possible, but with an impact-dependent priority. Example: Exposure of the core version number, Cross Site Scripting (XSS) limited to the admin interface.
None0.0These releases won't affect a large majority of projects, and may not require any action. They only impact projects with extremely complex or unlikely customisations. They do not impact projects which only implement common customisations or use common features.

Internal security process

See Silverstripe CMS Core Release Process.

Pre-announcement mailing list

In addition to our public disclosure process, we maintain a private mailing list where upcoming "high" and "critical" security releases are pre-announced. Members of this list will receive a security pre-announcement, as soon as it has been sufficiently researched, with a timeline for the upcoming release. This will happen a few days before the announcement goes public alongside a new release, and most likely before a patch has been developed.

Since we'll distribute sensitive information on unpatched vulnerabilities in this list, the selection criteria for joining naturally has to be strict. Applicants should provide references within the community, as well as a demonstrated need for this level of information (e.g. involvement with a large website with sensitive customer data). You don’t need to be a client of Silverstripe Ltd to get on board, but we will need to perform some low-touch background checks to verify your identity. Please contact for details.

Only "high" and "critical" issues are pre-announced via the mailing list. If you want to know about all the minor security mitigations, keep an eye on the "releases" forum category, changelogs and the website section Security Releases.

Quality assurance and testing

The quality of our software is important to us, and we continuously test it for regressions through a broad suite of unit and integration tests. Most of these run on Travis CI, and results are publicly available. Check the badges on the various modules available in the Silverstripe GitHub organisation. There's also a build matrix for our commercially supported modules (only showing build status for the default branch).