Issue #3424768 by mfb, OMD, cilefen, smustgrave: Channel description of RSS feeds is double-escaped

core/lib/Drupal/Core/EventSubscriber/RssResponseRelativeUrlFilter.php

@@ -57,10 +57,12 @@ protected function transformRootRelativeUrlsToAbsolute($rss_markup, Request $req
 
     // Invoke Html::transformRootRelativeUrlsToAbsolute() on all HTML content
     // embedded in this RSS feed.
-    foreach ($rss_dom->getElementsByTagName('description') as $node) {
-      $html_markup = $node->nodeValue;
-      if (!empty($html_markup)) {
-        $node->replaceChild($rss_dom->createTextNode(Html::transformRootRelativeUrlsToAbsolute($html_markup, $request->getSchemeAndHttpHost())), $node->firstChild);
+    foreach ($rss_dom->getElementsByTagName('item') as $item) {
+      foreach ($item->getElementsByTagName('description') as $node) {
+        $html_markup = $node->nodeValue;
+        if (!empty($html_markup)) {
+          $node->replaceChild($rss_dom->createTextNode(Html::transformRootRelativeUrlsToAbsolute($html_markup, $request->getSchemeAndHttpHost())), $node->firstChild);
+        }
       }
     }
 

core/tests/Drupal/Tests/Core/EventSubscriber/RssResponseRelativeUrlFilterTest.php

@@ -26,7 +26,7 @@ public static function providerTestOnResponse() {
 <channel>
   <title>Drupal.org</title>
   <link>https://www.drupal.org</link>
-  <description>Come for the software, stay for the community
+  <description>Come for the software &amp; stay for the community
 Drupal is an open source content management platform powering millions of websites and applications. It’s built, used, and supported by an active and diverse community of people around the world.</description>
   <language>en</language>
   <item>
@@ -45,7 +45,7 @@ public static function providerTestOnResponse() {
 <channel>
   <title>Drupal.org</title>
   <link>https://www.drupal.org</link>
-  <description>Come for the software, stay for the community
+  <description>Come for the software &amp; stay for the community
 Drupal is an open source content management platform powering millions of websites and applications. It’s built, used, and supported by an active and diverse community of people around the world.</description>
   <language>en</language>
   <item>