Index: typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php	(revision c3c398d4be47b9cf231d8ce0b91043839c4eca29)
+++ typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php	(revision )
@@ -1638,7 +1638,11 @@
 				if ($sourceInfo) {
 					$sourceConfiguration['width'] = $sourceInfo[0];
 					$sourceConfiguration['height'] = $sourceInfo[1];
-					$sourceConfiguration['src'] = htmlspecialchars($GLOBALS['TSFE']->absRefPrefix . $sourceInfo[3]);
+					$sourceInfoUrl = $sourceInfo[3];
+					if (parse_url($sourceInfoUrl, PHP_URL_HOST) == NULL) {
+						$sourceInfoUrl = $GLOBALS['TSFE']->absRefPrefix . $sourceInfoUrl;
+					}
+					$sourceConfiguration['src'] = htmlspecialchars($sourceInfoUrl);
 					$sourceConfiguration['selfClosingTagSlash'] = (!empty($GLOBALS['TSFE']->xhtmlDoctype) ? ' /' : '');
 
 					$oneSourceCollection = $this->substituteMarkerArray($sourceLayout, $sourceConfiguration, '###|###', TRUE, TRUE);