diff --git a/CHANGELOG.md b/CHANGELOG.md
index eb1c92cb8cf..6e5146d7283 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- HTML Purifier now allows `oembed` tags. ([ckeditor#59](https://github.com/craftcms/ckeditor/issues/59))
+- Added `craft\htmlpurifier\VideoEmbedUrlDef`.
 - Fixed a bug where entries that aren’t propagated to the primary site weren’t showing revision notes. ([#12641](https://github.com/craftcms/cms/issues/12641))
 - Fixed a bug where HTML tags weren’t getting stripped from auto-generated Handle and URI Format setting values.
 - Fixed a JavaScript error that could occur if an object with `null `values was passed to `Craft.compare()`.
diff --git a/src/helpers/HtmlPurifier.php b/src/helpers/HtmlPurifier.php
index aec5dcfa5e2..436072f2f66 100644
--- a/src/helpers/HtmlPurifier.php
+++ b/src/helpers/HtmlPurifier.php
@@ -7,6 +7,7 @@
 
 namespace craft\helpers;
 
+use craft\htmlpurifier\VideoEmbedUrlDef;
 use HTMLPurifier_Config;
 
 /**
@@ -71,6 +72,9 @@ public static function configure($config)
 
             // https://github.com/ezyang/htmlpurifier/issues/152#issuecomment-414192516
             $def->addAttribute('a', 'download', 'URI');
+
+            $def->addElement('oembed', 'Block', 'Inline', 'Common');
+            $def->addAttribute('oembed', 'url', new VideoEmbedUrlDef());
         }
     }
 }
diff --git a/src/htmlpurifier/VideoEmbedUrlDef.php b/src/htmlpurifier/VideoEmbedUrlDef.php
new file mode 100644
index 00000000000..2a8fb4ff8f9
--- /dev/null
+++ b/src/htmlpurifier/VideoEmbedUrlDef.php
@@ -0,0 +1,31 @@
+<?php
+/**
+ * @link https://craftcms.com/
+ * @copyright Copyright (c) Pixel & Tonic, Inc.
+ * @license https://craftcms.github.io/license/
+ */
+
+namespace craft\htmlpurifier;
+
+use HTMLPurifier_AttrDef_URI;
+
+/**
+ * Class VideoEmbedUrlDef
+ *
+ * @author Pixel & Tonic, Inc. <support@pixelandtonic.com>
+ * @since 3.7.66
+ */
+class VideoEmbedUrlDef extends HTMLPurifier_AttrDef_URI
+{
+    public function validate($uri, $config, $context)
+    {
+        $regexp = $config->get('URI.SafeIframeRegexp');
+        if ($regexp !== null) {
+            if (!preg_match($regexp, $uri)) {
+                return false;
+            }
+        }
+
+        return parent::validate($uri, $config, $context);
+    }
+}