diff --git a/typo3/sysext/backend/Classes/Controller/File/CreateFolderController.php b/typo3/sysext/backend/Classes/Controller/File/CreateFolderController.php
index 3f0000d34b498cb17b654678ae1af3829e5dd501..87ef805aaaaa25fe757ad3ba1acebbd4b76d2683 100644
--- a/typo3/sysext/backend/Classes/Controller/File/CreateFolderController.php
+++ b/typo3/sysext/backend/Classes/Controller/File/CreateFolderController.php
@@ -223,7 +223,7 @@ class CreateFolderController extends AbstractModule
             $fileExtList = array();
             $onlineMediaFileExt = OnlineMediaHelperRegistry::getInstance()->getSupportedFileExtensions();
             foreach ($onlineMediaFileExt as $fileExt) {
-                if (GeneralUtility::verifyFilenameAgainstDenyPattern($fileExt)) {
+                if (GeneralUtility::verifyFilenameAgainstDenyPattern('.' . $fileExt)) {
                     $fileExtList[] = '<span class="label label-success">' . strtoupper(htmlspecialchars($fileExt)) . '</span>';
                 }
             }
@@ -262,7 +262,7 @@ class CreateFolderController extends AbstractModule
             $fileExtList = array();
             $textFileExt = GeneralUtility::trimExplode(',', $GLOBALS['TYPO3_CONF_VARS']['SYS']['textfile_ext'], true);
             foreach ($textFileExt as $fileExt) {
-                if (GeneralUtility::verifyFilenameAgainstDenyPattern($fileExt)) {
+                if (GeneralUtility::verifyFilenameAgainstDenyPattern('.' . $fileExt)) {
                     $fileExtList[] = '<span class="label label-success">' . strtoupper(htmlspecialchars($fileExt)) . '</span>';
                 }
             }
diff --git a/typo3/sysext/recordlist/Classes/View/FolderUtilityRenderer.php b/typo3/sysext/recordlist/Classes/View/FolderUtilityRenderer.php
index f578ad83c148a8cccb1533a07308262e6548a704..9ca30f2780926931133792c8cac376d94eba4d57 100644
--- a/typo3/sysext/recordlist/Classes/View/FolderUtilityRenderer.php
+++ b/typo3/sysext/recordlist/Classes/View/FolderUtilityRenderer.php
@@ -122,7 +122,7 @@ class FolderUtilityRenderer
         // Create a list of allowed file extensions with the readable format "youtube, vimeo" etc.
         $fileExtList = array();
         foreach ($allowedExtensions as $fileExt) {
-            if (GeneralUtility::verifyFilenameAgainstDenyPattern($fileExt)) {
+            if (GeneralUtility::verifyFilenameAgainstDenyPattern('.' . $fileExt)) {
                 $fileExtList[] = '<span class="label label-success">'
                     . strtoupper(htmlspecialchars($fileExt)) . '</span>';
             }
@@ -182,7 +182,7 @@ class FolderUtilityRenderer
         $fileExtList = array();
         $onlineMediaFileExt = OnlineMediaHelperRegistry::getInstance()->getSupportedFileExtensions();
         foreach ($onlineMediaFileExt as $fileExt) {
-            if (GeneralUtility::verifyFilenameAgainstDenyPattern($fileExt)
+            if (GeneralUtility::verifyFilenameAgainstDenyPattern('.' . $fileExt)
                 && (empty($allowedExtensions) || in_array($fileExt, $allowedExtensions, true))
             ) {
                 $fileExtList[] = '<span class="label label-success">'