diff --git a/phpstan.neon b/phpstan.neon
index ddf86fd7620..81cfaa11497 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -286,6 +286,7 @@ parameters:
             message: '#Function "class_exists\(\)" cannot be used/left in the code#'
             paths:
                 - bin/rector.php
+                - src/Bootstrap/ExtensionConfigResolver.php
 
         -
             message: '#Do not use static property#'
@@ -528,3 +529,13 @@ parameters:
             path: rules/TypeDeclaration/Rector/ClassMethod/ParamTypeFromStrictTypedPropertyRector.php
 
         - '#Method Rector\\Core\\PhpParser\\Node\\BetterNodeFinder\:\:findParentTypes\(\) should return T of PhpParser\\Node\|null but returns class\-string<T of PhpParser\\Node\>\|T of PhpParser\\Node#'
+
+        -
+             message: '#Parameter \#1\ $argument of class ReflectionClass constructor expects class-string<Rector\\RectorInstaller\\GeneratedConfig>|Rector\\RectorInstaller\\GeneratedConfig, string given.#'
+             paths:
+                 - src/Bootstrap/ExtensionConfigResolver.php
+
+        -
+             message: '#Cognitive complexity for "Rector\\Core\\Bootstrap\\ExtensionConfigResolver\:\:appendExtensionsConfig\(\)" is 13, keep it under 9#'
+             paths:
+                 - src/Bootstrap/ExtensionConfigResolver.php
diff --git a/src/Bootstrap/ExtensionConfigResolver.php b/src/Bootstrap/ExtensionConfigResolver.php
new file mode 100644
index 00000000000..c187f4644ae
--- /dev/null
+++ b/src/Bootstrap/ExtensionConfigResolver.php
@@ -0,0 +1,51 @@
+<?php
+declare(strict_types=1);
+
+namespace Rector\Core\Bootstrap;
+
+use Symplify\SmartFileSystem\SmartFileInfo;
+
+final class ExtensionConfigResolver
+{
+    /**
+     * @param SmartFileInfo[] $configFileInfos
+     * @return SmartFileInfo[]
+     */
+    public function appendExtensionsConfig(array $configFileInfos): array
+    {
+        if (! class_exists('Rector\RectorInstaller\GeneratedConfig')) {
+            return $configFileInfos;
+        }
+
+        $generatedConfigReflection = new \ReflectionClass('Rector\RectorInstaller\GeneratedConfig');
+
+        if ($generatedConfigReflection->getFileName() === false) {
+            return $configFileInfos;
+        }
+
+        $generatedConfigDirectory = dirname($generatedConfigReflection->getFileName());
+        foreach (\Rector\RectorInstaller\GeneratedConfig::EXTENSIONS as $name => $extensionConfig) {
+            foreach ($extensionConfig['extra']['includes'] ?? [] as $includedFile) {
+                $includedFilePath = null;
+                if (isset($extensionConfig['relative_install_path'])) {
+                    $includedFilePath = sprintf(
+                        '%s/%s/%s',
+                        $generatedConfigDirectory,
+                        $extensionConfig['relative_install_path'],
+                        $includedFile
+                    );
+                    if (! file_exists($includedFilePath) || ! is_readable($includedFilePath)) {
+                        $includedFilePath = null;
+                    }
+                }
+
+                if ($includedFilePath === null) {
+                    $includedFilePath = sprintf('%s/%s', $extensionConfig['install_path'], $includedFile);
+                }
+                $configFileInfos[] = new SmartFileInfo($includedFilePath);
+            }
+        }
+
+        return $configFileInfos;
+    }
+}
diff --git a/src/Bootstrap/RectorConfigsResolver.php b/src/Bootstrap/RectorConfigsResolver.php
index 18f10f45326..3b01a59a82d 100644
--- a/src/Bootstrap/RectorConfigsResolver.php
+++ b/src/Bootstrap/RectorConfigsResolver.php
@@ -26,10 +26,16 @@ final class RectorConfigsResolver
      */
     private $setConfigResolver;
 
+    /**
+     * @var ExtensionConfigResolver
+     */
+    private $extensionConfigResolver;
+
     public function __construct()
     {
         $this->setConfigResolver = new SetConfigResolver();
         $this->configResolver = new ConfigResolver();
+        $this->extensionConfigResolver = new ExtensionConfigResolver();
     }
 
     /**
@@ -64,6 +70,7 @@ public function provide(): BootstrapConfigs
         ) : [];
 
         $configFileInfos = $this->appendRectorRecipeConfig($argvInput, $configFileInfos);
+        $configFileInfos = $this->extensionConfigResolver->appendExtensionsConfig($configFileInfos);
 
         return new BootstrapConfigs($mainConfigFileInfo, $configFileInfos);
     }