diff --git a/admin/cli/install.php b/admin/cli/install.php
index 80bcdd9d906..09768816040 100644
--- a/admin/cli/install.php
+++ b/admin/cli/install.php
@@ -177,6 +177,7 @@ $CFG->admin                = array_pop($parts);
 ini_set('include_path', $CFG->libdir.'/pear' . PATH_SEPARATOR . ini_get('include_path'));
 
 require_once($CFG->libdir.'/classes/component.php');
+
 require_once($CFG->libdir.'/classes/text.php');
 require_once($CFG->libdir.'/classes/string_manager.php');
 require_once($CFG->libdir.'/classes/string_manager_install.php');
@@ -192,13 +193,8 @@ require_once($CFG->libdir.'/adminlib.php');
 require_once($CFG->libdir.'/componentlib.class.php');
 require_once($CFG->dirroot.'/cache/lib.php');
 
-// Register our classloader, in theory somebody might want to replace it to load other hacked core classes.
-// Required because the database checks below lead to session interaction which is going to lead us to requiring autoloaded classes.
-if (defined('COMPONENT_CLASSLOADER')) {
-    spl_autoload_register(COMPONENT_CLASSLOADER);
-} else {
-    spl_autoload_register('core_component::classloader');
-}
+// Register our classloader.
+\core_component::register_autoloader();
 
 require($CFG->dirroot.'/version.php');
 $CFG->target_release = $release;
diff --git a/install.php b/install.php
index 70c9e155b72..cfb1112889c 100644
--- a/install.php
+++ b/install.php
@@ -218,13 +218,9 @@ require_once($CFG->dirroot.'/cache/lib.php');
 //the problem is that we need specific version of quickforms and hacked excel files :-(
 ini_set('include_path', $CFG->libdir.'/pear' . PATH_SEPARATOR . ini_get('include_path'));
 
-// Register our classloader, in theory somebody might want to replace it to load other hacked core classes.
-// Required because the database checks below lead to session interaction which is going to lead us to requiring autoloaded classes.
-if (defined('COMPONENT_CLASSLOADER')) {
-    spl_autoload_register(COMPONENT_CLASSLOADER);
-} else {
-    spl_autoload_register('core_component::classloader');
-}
+// Register our classloader.
+\core_component::register_autoloader();
+
 
 require('version.php');
 $CFG->target_release = $release;
@@ -653,4 +649,3 @@ echo '</div>';
 
 install_print_footer($config);
 die;
-
diff --git a/lib/classes/component.php b/lib/classes/component.php
index a9c3aef5973..d954186e738 100644
--- a/lib/classes/component.php
+++ b/lib/classes/component.php
@@ -129,6 +129,45 @@ class core_component {
         'Invoker' => 'lib/php-di/invoker/src',
     ];
 
+    /**
+     *  An array containing files which are normally in a package's composer/autoload.files section.
+     *
+     * PHP does not provide a mechanism for automatically including the files that methods are in.
+     *
+     * The Composer autoloader includes all files in this section of the composer.json file during the instantiation of the loader.
+     *
+     * @var array<string>
+     */
+    protected static $composerautoloadfiles = [
+        'lib/aws-sdk/src/functions.php',
+        'lib/guzzlehttp/guzzle/src/functions_include.php',
+        'lib/guzzlehttp/promises/src/functions_include.php',
+        'lib/jmespath/src/JmesPath.php',
+        'lib/php-di/php-di/src/functions.php',
+        'lib/ralouphi/getallheaders/src/getallheaders.php',
+        'lib/symfony/deprecation-contracts/function.php',
+    ];
+
+    /**
+     * Register the Moodle class autoloader.
+     */
+    public static function register_autoloader(): void {
+        if (defined('COMPONENT_CLASSLOADER')) {
+            spl_autoload_register(COMPONENT_CLASSLOADER);
+        } else {
+            spl_autoload_register([self::class, 'classloader']);
+        }
+
+        // Load any composer-driven autoload files.
+        // This is intended to mimic the behaviour of the standard Composer Autoloader.
+        foreach (static::$composerautoloadfiles as $file) {
+            $path = dirname(__DIR__, 2) . '/' . $file;
+            if (file_exists($path)) {
+                require_once($path);
+            }
+        }
+    }
+
     /**
      * Class loader for Frankenstyle named classes in standard locations.
      * Frankenstyle namespaces are supported.
diff --git a/lib/setup.php b/lib/setup.php
index 71f1e7c0328..dd163234f59 100644
--- a/lib/setup.php
+++ b/lib/setup.php
@@ -620,12 +620,8 @@ if (!empty($_SERVER['HTTP_X_moz']) && $_SERVER['HTTP_X_moz'] === 'prefetch'){
 //the problem is that we need specific version of quickforms and hacked excel files :-(
 ini_set('include_path', $CFG->libdir.'/pear' . PATH_SEPARATOR . ini_get('include_path'));
 
-// Register our classloader, in theory somebody might want to replace it to load other hacked core classes.
-if (defined('COMPONENT_CLASSLOADER')) {
-    spl_autoload_register(COMPONENT_CLASSLOADER);
-} else {
-    spl_autoload_register('core_component::classloader');
-}
+// Register our classloader.
+\core_component::register_autoloader();
 
 // Remember the default PHP timezone, we will need it later.
 core_date::store_default_php_timezone();
diff --git a/lib/upgrade.txt b/lib/upgrade.txt
index 4ad47cbd7dd..b8fff691a75 100644
--- a/lib/upgrade.txt
+++ b/lib/upgrade.txt
@@ -1,6 +1,13 @@
 This files describes API changes in core libraries and APIs,
 information provided here is intended especially for developers.
 
+=== 4.4.3 ===
+
+* The Moodle autoloader should now be registered using `\core\component::register_autoloader` rather
+  than manually doing so in any exceptional location which requires it. It is not normally necessary
+  to include the autoloader manually, as it is registered automatically when the Moodle environment
+  is bootstrapped.
+
 === 4.4.2 ===
 
 * The `\core\dataformat::get_format_instance` method is now public, and can be used to retrieve a writer instance for