diff --git a/composer.json b/composer.json
index 7fd43d81d..63c3ffaf5 100644
--- a/composer.json
+++ b/composer.json
@@ -31,7 +31,7 @@
   "require": {
     "php": "^8.2",
     "ext-dom": "*",
-    "contao-community-alliance/dc-general": "^2.4.2",
+    "contao-community-alliance/dc-general": "^2.4.12",
     "contao-community-alliance/events-contao-bindings": "^5.0",
     "contao-community-alliance/meta-palettes": "^2.0.10",
     "contao-community-alliance/translator": "^2.5",
diff --git a/src/Attribute/Base.php b/src/Attribute/Base.php
index 58db16bac..6152b0680 100644
--- a/src/Attribute/Base.php
+++ b/src/Attribute/Base.php
@@ -3,7 +3,7 @@
 /**
  * This file is part of MetaModels/core.
  *
- * (c) 2012-2025 The MetaModels team.
+ * (c) 2012-2026 The MetaModels team.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
@@ -19,7 +19,7 @@
  * @author     David Molineus <david.molineus@netzmacht.de>
  * @author     Sven Baumann <baumann.sv@gmail.com>
  * @author     Ingolf Steinhardt <info@e-spin.de>
- * @copyright  2012-2025 The MetaModels team.
+ * @copyright  2012-2026 The MetaModels team.
  * @license    https://github.com/MetaModels/core/blob/master/LICENSE LGPL-3.0-or-later
  * @filesource
  */
@@ -526,6 +526,7 @@ private function setBaseEval($fieldDefinition, $overrides)
             'preserveTags',
             'decodeEntities',
             'rte',
+            'highlight',
             'rows',
             'cols',
             'spaceToUnderscore',
diff --git a/src/CoreBundle/EventListener/DcGeneral/Table/DcaSetting/AceHighlightVisibilityListener.php b/src/CoreBundle/EventListener/DcGeneral/Table/DcaSetting/AceHighlightVisibilityListener.php
new file mode 100644
index 000000000..a356e00bc
--- /dev/null
+++ b/src/CoreBundle/EventListener/DcGeneral/Table/DcaSetting/AceHighlightVisibilityListener.php
@@ -0,0 +1,109 @@
+<?php
+
+/**
+ * This file is part of MetaModels/core.
+ *
+ * (c) 2012-2026 The MetaModels team.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * This project is provided in good faith and hope to be usable by anyone.
+ *
+ * @package    MetaModels/core
+ * @author     Ingolf Steinhardt <info@e-spin.de>
+ * @copyright  2012-2026 The MetaModels team.
+ * @license    https://github.com/MetaModels/core/blob/master/LICENSE LGPL-3.0-or-later
+ * @filesource
+ */
+
+namespace MetaModels\CoreBundle\EventListener\DcGeneral\Table\DcaSetting;
+
+use ContaoCommunityAlliance\DcGeneral\Data\ModelInterface;
+use ContaoCommunityAlliance\DcGeneral\Data\PropertyValueBag;
+use ContaoCommunityAlliance\DcGeneral\DataDefinition\Palette\Condition\Property\PropertyCallbackCondition;
+use ContaoCommunityAlliance\DcGeneral\DataDefinition\Palette\Condition\Property\PropertyConditionChain;
+use ContaoCommunityAlliance\DcGeneral\DataDefinition\Palette\Condition\Property\PropertyValueCondition;
+use ContaoCommunityAlliance\DcGeneral\DataDefinition\Palette\PropertyInterface;
+use ContaoCommunityAlliance\DcGeneral\Factory\Event\BuildDataDefinitionEvent;
+
+/**
+ * Replaces the exact-match condition for the "highlight" property's "rte" selector with a prefix match,
+ * so that "highlight" is visible for all ACE editor template variants (e.g. "ace", "ace_mm").
+ */
+final class AceHighlightVisibilityListener
+{
+    /**
+     * Replace the PropertyValueCondition('rte', 'ace') on the "highlight" property with a callback
+     * condition that matches any rte value starting with 'ace'.
+     *
+     * @param BuildDataDefinitionEvent $event The event.
+     *
+     * @return void
+     */
+    public function handle(BuildDataDefinitionEvent $event): void
+    {
+        if ($event->getContainer()->getName() !== 'tl_metamodel_dcasetting') {
+            return;
+        }
+
+        if (!$event->getContainer()->hasPalettesDefinition()) {
+            return;
+        }
+
+        $palettesDefinition = $event->getContainer()->getPalettesDefinition();
+
+        foreach ($palettesDefinition->getPalettes() as $palette) {
+            foreach ($palette->getLegends() as $legend) {
+                foreach ($legend->getProperties() as $property) {
+                    if ($property->getName() !== 'highlight') {
+                        continue;
+                    }
+
+                    $this->replaceRteValueCondition($property);
+                }
+            }
+        }
+    }
+
+    /**
+     * Replace PropertyValueCondition('rte', *) in the property's AND chain with a prefix callback.
+     *
+     * @param PropertyInterface $property The palette property.
+     *
+     * @return void
+     */
+    private function replaceRteValueCondition(PropertyInterface $property): void
+    {
+        $condition = $property->getVisibleCondition();
+        if (!($condition instanceof PropertyConditionChain)) {
+            return;
+        }
+
+        foreach ($condition->getConditions() as $subCondition) {
+            if (
+                ($subCondition instanceof PropertyValueCondition)
+                && ($subCondition->getPropertyName() === 'rte')
+            ) {
+                $condition->removeCondition($subCondition);
+                $condition->addCondition(
+                    new PropertyCallbackCondition(
+                        static function (?ModelInterface $model, ?PropertyValueBag $input): bool {
+                            if (null !== $input && $input->hasPropertyValue('rte')) {
+                                $value = $input->getPropertyValue('rte');
+                            } elseif (null !== $model) {
+                                $value = $model->getProperty('rte');
+                            } else {
+                                return false;
+                            }
+
+                            return \is_string($value) && \str_starts_with($value, 'ace');
+                        }
+                    )
+                );
+
+                return;
+            }
+        }
+    }
+}
diff --git a/src/CoreBundle/EventListener/DcGeneral/Table/DcaSetting/RichTextOptionListener.php b/src/CoreBundle/EventListener/DcGeneral/Table/DcaSetting/RichTextOptionListener.php
index 3d7b62db6..8f0f83f40 100644
--- a/src/CoreBundle/EventListener/DcGeneral/Table/DcaSetting/RichTextOptionListener.php
+++ b/src/CoreBundle/EventListener/DcGeneral/Table/DcaSetting/RichTextOptionListener.php
@@ -3,7 +3,7 @@
 /**
  * This file is part of MetaModels/core.
  *
- * (c) 2012-2019 The MetaModels team.
+ * (c) 2012-2026 The MetaModels team.
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
@@ -14,7 +14,7 @@
  * @author     Christian Schiffler <c.schiffler@cyberspectrum.de>
  * @author     Ingolf Steinhardt <info@e-spin.de>
  * @author     Sven Baumann <baumann.sv@gmail.com>
- * @copyright  2012-2019 The MetaModels team.
+ * @copyright  2012-2026 The MetaModels team.
  * @license    https://github.com/MetaModels/core/blob/master/LICENSE LGPL-3.0-or-later
  * @filesource
  */
@@ -64,9 +64,14 @@ public function handle(GetPropertyOptionsEvent $event)
 
         $configs = [];
         // Delete 'be_' prefix from keys.
+        // Add tiny templates.
         foreach ($this->templateList->getTemplatesForBase('be_tiny') as $key => $value) {
             $configs[substr($key, 3)] = $value;
         }
+        // Add ace templates.
+        foreach ($this->templateList->getTemplatesForBase('be_ace') as $key => $value) {
+            $configs[substr($key, 3)] = $value;
+        }
 
         $event->setOptions($configs);
     }
diff --git a/src/CoreBundle/Resources/config/dc-general/table/tl_dcasetting.yml b/src/CoreBundle/Resources/config/dc-general/table/tl_dcasetting.yml
index 0e306f3c3..88c56677d 100644
--- a/src/CoreBundle/Resources/config/dc-general/table/tl_dcasetting.yml
+++ b/src/CoreBundle/Resources/config/dc-general/table/tl_dcasetting.yml
@@ -99,6 +99,14 @@ services:
         event: dc-general.factory.build-data-definition
         method: handle
 
+  metamodels.listener.table.tl_metamodel_dcasetting.ace_highlight_visibility:
+    class: MetaModels\CoreBundle\EventListener\DcGeneral\Table\DcaSetting\AceHighlightVisibilityListener
+    tags:
+      - name: kernel.event_listener
+        event: dc-general.factory.build-data-definition
+        method: handle
+        priority: -100
+
   metamodels.listener.table.tl_metamodel_dcasetting.rich_text_options:
     class: MetaModels\CoreBundle\EventListener\DcGeneral\Table\DcaSetting\RichTextOptionListener
     arguments:
@@ -154,3 +162,4 @@ services:
       - name: kernel.event_listener
         event: dc-general.view.contao2backend.manipulate-widget
         method: handle
+
diff --git a/src/CoreBundle/Resources/contao/dca/tl_metamodel_dcasetting.php b/src/CoreBundle/Resources/contao/dca/tl_metamodel_dcasetting.php
index 7d4e1b2ef..62854fe21 100644
--- a/src/CoreBundle/Resources/contao/dca/tl_metamodel_dcasetting.php
+++ b/src/CoreBundle/Resources/contao/dca/tl_metamodel_dcasetting.php
@@ -244,6 +244,7 @@
             // * preserveTags       do not encode html tags.
             // * decodeEntities     do decode HTML entities.
             // * rte                enable richtext editor on this
+            // * highlight          set type of highlighting for ACE editor
             // * rows               amount of rows in longtext and tables.
             // * cols               amount of columns in longtext and tables.
             // * trailingSlash      allow trailing slash, 2 => do nothing, 1 => add one on save, 0 => strip it on save.
@@ -253,7 +254,14 @@
             // * readonly           readonly.
             // * be_template        widget template for backend.
             // * fe_template        form template for frontend.
-        ]
+        ],
+        'rte'     => [
+            'ace' => [
+                'presentation after rte' => [
+                    'highlight',
+                ]
+            ]
+        ],
     ],
     'fields'                => [
         'id'                 => [
@@ -442,9 +450,43 @@
             'eval'        => [
                 'tl_class'           => 'w50',
                 'includeBlankOption' => true,
+                'submitOnChange'     => true,
             ],
             'sql'         => "varchar(64) NOT NULL default 'tinyMCE'"
         ],
+        'highlight'          => [
+            'label'       => 'highlight.label',
+            'description' => 'highlight.description',
+            'inputType' => 'select',
+            'options'   => [
+                'Apache',
+                'Bash',
+                'C#',
+                'C++',
+                'CSS',
+                'Diff',
+                'HTML',
+                'HTTP',
+                'Ini',
+                'JSON',
+                'Java',
+                'JavaScript',
+                'Markdown',
+                'Nginx',
+                'Perl',
+                'PHP',
+                'PowerShell',
+                'Python',
+                'Ruby',
+                'SCSS',
+                'SQL',
+                'Twig',
+                'YAML',
+                'XML'
+            ],
+            'eval'      => ['includeBlankOption' => true, 'decodeEntities' => true, 'tl_class' => 'w50'],
+            'sql'       => "varchar(32) COLLATE ascii_bin NOT NULL default ''"
+        ],
         'rows'               => [
             'label'       => 'rows.label',
             'description' => 'rows.description',
@@ -452,7 +494,7 @@
             'inputType'   => 'text',
             'eval'        =>
                 [
-                    'tl_class' => 'w50',
+                    'tl_class' => 'clr w50',
                     'rgxp'     => 'digit'
                 ],
             'sql'         => "int(10) NOT NULL default '0'"
diff --git a/src/CoreBundle/Resources/contao/templates/be_ace_mm.html5 b/src/CoreBundle/Resources/contao/templates/be_ace_mm.html5
new file mode 100644
index 000000000..3adec21a3
--- /dev/null
+++ b/src/CoreBundle/Resources/contao/templates/be_ace_mm.html5
@@ -0,0 +1,79 @@
+<?php
+
+namespace Contao;
+
+if ($GLOBALS['TL_CONFIG']['useCE']):
+
+// Use document.write() here in case ACE is loaded in a subpalette (see #1424)
+?>
+<script>window.ace || document.write('<script src="<?= $this->asset('js/ace.js', 'contao-components/ace') ?>" charset="utf-8">\x3C/script><script src="<?= $this->asset('js/ext-language_tools.js', 'contao-components/ace') ?>" charset="utf-8">\x3C/script><script src="<?= $this->asset('js/ext-whitespace.js', 'contao-components/ace') ?>" charset="utf-8">\x3C/script>')</script>
+<script>
+window.ace && window.addEvent('domready', function() {
+  let ta = document.getElementById('<?= $this->selector ?>');
+  if (!ta) return;
+
+  // Create a div to apply the editor to
+  let div = document.createElement('div');
+  div.id = '<?= $this->selector ?>_div';
+  div.className = ta.className;
+  ta.parentNode.insertBefore(div, ta.nextSibling);
+
+  // Hide the textarea
+  ta.style['display'] = 'none';
+
+  // Instantiate the editor
+  let editor = ace.edit('<?= $this->selector ?>_div', {maxLines: Infinity});
+  editor.$blockScrolling = Infinity;
+  editor.setTheme((document.documentElement.dataset.colorScheme === 'dark' ? 'ace/theme/twilight' : 'ace/theme/clouds'));
+  editor.renderer.setScrollMargin(3, 3, 0, 0);
+  editor.renderer.scrollBy(0, -6);
+  editor.container.style.lineHeight = 1.45;
+  editor.getSession().setValue(ta.value);
+  editor.getSession().setMode("ace/mode/<?= Backend::getAceType($this->type) ?>");
+  editor.getSession().setUseSoftTabs(false);
+  editor.getSession().setUseWrapMode(true);
+  editor.setAutoScrollEditorIntoView(true);
+
+  <?php if ($this->readonly): ?>
+    editor.setReadOnly(true);
+  <?php endif; ?>
+
+  // Auto-detect the indentation
+  let ws = ace.require('ace/ext/whitespace');
+  ws.detectIndentation(editor.getSession());
+
+  // Add the fullscreen command
+  editor.commands.addCommand({
+    name: 'Fullscreen',
+    bindKey: 'F11',
+    exec: function(editor) {
+      let dom = ace.require('ace/lib/dom');
+      dom.toggleCssClass(document.body, 'ace-fullsize');
+      editor.resize();
+    }
+  });
+
+  editor.setOptions({
+    enableSnippets: true,
+    enableBasicAutocompletion: true,
+    enableLiveAutocompletion: true,
+    enableKeyboardAccessibility: true,
+    <?php if (!empty($this->rows)): ?>
+    maxLines: <?= $this->rows ?>,
+    minLines: 2,
+    <?php endif; ?>
+  });
+
+  editor.on('focus', function() {
+    window.dispatchEvent(new Event('store-scroll-offset'));
+  });
+
+  editor.getSession().on('change', function() {
+    ta.value = editor.getValue();
+  });
+
+  // Disable command conflicts with AltGr (see #5792)
+  editor.commands.bindKey('Ctrl-alt-a|Ctrl-alt-e|Ctrl-alt-h|Ctrl-alt-l|Ctrl-alt-s', null);
+});
+</script>
+<?php endif; ?>
diff --git a/src/CoreBundle/Resources/contao/templates/be_tinyMCE_mm.html5 b/src/CoreBundle/Resources/contao/templates/be_tinyMCE_mm.html5
new file mode 100644
index 000000000..bbf82c72a
--- /dev/null
+++ b/src/CoreBundle/Resources/contao/templates/be_tinyMCE_mm.html5
@@ -0,0 +1,7 @@
+<?php $this->extend('be_tinyMCE'); ?>
+
+<?php $this->block('custom'); ?>
+<?php if (!empty($this->rows)): ?>
+    max_height: <?= $this->rows ?>,
+<?php endif; ?>
+<?php $this->endblock(); ?>
diff --git a/src/CoreBundle/Resources/translations/tl_metamodel_dcasetting.de.xlf b/src/CoreBundle/Resources/translations/tl_metamodel_dcasetting.de.xlf
index 71c3b9862..542015134 100644
--- a/src/CoreBundle/Resources/translations/tl_metamodel_dcasetting.de.xlf
+++ b/src/CoreBundle/Resources/translations/tl_metamodel_dcasetting.de.xlf
@@ -269,6 +269,14 @@
         <source>Select the rich text configuration that shall be used on this field (if any).</source>
         <target>Wählen Sie eine Voreinstellung für den Richtext-Editor aus, die für dieses Feld benutzt werden soll (falls vorhanden).</target>
       </trans-unit>
+      <trans-unit id="highlight.label" resname="highlight.label">
+        <source>Syntax highlighting mode</source>
+        <target>Syntax-Hervorhebungsmodus</target>
+      </trans-unit>
+      <trans-unit id="highlight.description" resname="highlight.description">
+        <source>Select the syntax highlighting mode for the ACE editor (e.g. "html", "css", "javascript"). Only relevant when an ACE editor configuration is selected.</source>
+        <target>Wählen Sie den Syntax-Hervorhebungsmodus für den ACE-Editor (z.B. "html", "css", "javascript"). Nur relevant, wenn eine ACE-Editor-Konfiguration ausgewählt ist.</target>
+      </trans-unit>
       <trans-unit id="rows.label" resname="rows.label">
         <source>Rows</source>
         <target>Zeilen</target>
diff --git a/src/CoreBundle/Resources/translations/tl_metamodel_dcasetting.en.xlf b/src/CoreBundle/Resources/translations/tl_metamodel_dcasetting.en.xlf
index 5dee9627d..afa148e6c 100644
--- a/src/CoreBundle/Resources/translations/tl_metamodel_dcasetting.en.xlf
+++ b/src/CoreBundle/Resources/translations/tl_metamodel_dcasetting.en.xlf
@@ -205,6 +205,12 @@
       <trans-unit id="rte.description" resname="rte.description">
         <source>Select the rich text configuration that shall be used on this field (if any).</source>
       </trans-unit>
+      <trans-unit id="highlight.label" resname="highlight.label">
+        <source>Syntax highlighting mode</source>
+      </trans-unit>
+      <trans-unit id="highlight.description" resname="highlight.description">
+        <source>Select the syntax highlighting mode for the ACE editor (e.g. "html", "css", "javascript"). Only relevant when an ACE editor configuration is selected.</source>
+      </trans-unit>
       <trans-unit id="rows.label" resname="rows.label">
         <source>Rows</source>
       </trans-unit>