diff --git a/app/code/core/Mage/Cms/Model/Wysiwyg/Config.php b/app/code/core/Mage/Cms/Model/Wysiwyg/Config.php
index 194ab470de5..11c70d933a6 100644
--- a/app/code/core/Mage/Cms/Model/Wysiwyg/Config.php
+++ b/app/code/core/Mage/Cms/Model/Wysiwyg/Config.php
@@ -14,6 +14,8 @@
  * @license    https://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
  */
 
+use Composer\InstalledVersions;
+
 /**
  * Wysiwyg Config for Editor HTML Element
  *
@@ -25,6 +27,11 @@
  */
 class Mage_Cms_Model_Wysiwyg_Config extends Varien_Object
 {
+    /**
+     * Wysiwyg store config path
+     */
+    public const WYSIWYG_CONFIG_ENABLED = 'cms/wysiwyg/enabled';
+
     /**
      * Wysiwyg behaviour: enabled
      */
@@ -138,11 +145,15 @@ public function getSkinImagePlaceholderPath()
      */
     public function isEnabled()
     {
+        if (!InstalledVersions::isInstalled('tinymce/tinymce')) {
+            return false;
+        }
+
         $storeId = $this->getStoreId();
         if (!is_null($storeId)) {
-            $wysiwygState = Mage::getStoreConfig('cms/wysiwyg/enabled', $storeId);
+            $wysiwygState = Mage::getStoreConfig(self::WYSIWYG_CONFIG_ENABLED, $storeId);
         } else {
-            $wysiwygState = Mage::getStoreConfig('cms/wysiwyg/enabled');
+            $wysiwygState = Mage::getStoreConfig(self::WYSIWYG_CONFIG_ENABLED);
         }
         return in_array($wysiwygState, [self::WYSIWYG_ENABLED, self::WYSIWYG_HIDDEN]);
     }
@@ -154,6 +165,6 @@ public function isEnabled()
      */
     public function isHidden()
     {
-        return Mage::getStoreConfig('cms/wysiwyg/enabled') == self::WYSIWYG_HIDDEN;
+        return Mage::getStoreConfig(self::WYSIWYG_CONFIG_ENABLED) == self::WYSIWYG_HIDDEN;
     }
 }
diff --git a/composer.json b/composer.json
index 7a8d4664719..5a8632ae484 100644
--- a/composer.json
+++ b/composer.json
@@ -24,6 +24,7 @@
         "ext-simplexml": "*",
         "ext-soap": "*",
         "ext-zlib": "*",
+        "composer-runtime-api": "^2",
         "colinmollenhour/cache-backend-redis": "^1.14",
         "colinmollenhour/magento-redis-session": "^3.2.0",
         "cweagans/composer-patches": "^1.7",
@@ -48,7 +49,6 @@
     },
     "require-dev": {
         "ext-xmlreader": "*",
-        "composer/composer": "^2.7",
         "dealerdirect/phpcodesniffer-composer-installer": "^1.0.0",
         "friendsofphp/php-cs-fixer": "^3.6",
         "macopedia/phpstan-magento1": "^1.1",
diff --git a/composer.lock b/composer.lock
index 5df0e1b6762..ef05de59f21 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "a2bb45fc20fd05cec1e2e1e3dc9503d7",
+    "content-hash": "992538810d2699241a4b7525097ee91b",
     "packages": [
         {
             "name": "colinmollenhour/cache-backend-redis",
@@ -7659,7 +7659,8 @@
         "ext-pdo_mysql": "*",
         "ext-simplexml": "*",
         "ext-soap": "*",
-        "ext-zlib": "*"
+        "ext-zlib": "*",
+        "composer-runtime-api": "^2"
     },
     "platform-dev": {
         "ext-xmlreader": "*"
@@ -7667,5 +7668,5 @@
     "platform-overrides": {
         "php": "7.4"
     },
-    "plugin-api-version": "2.3.0"
+    "plugin-api-version": "2.6.0"
 }