Index: mediawiki-1.23.13/includes/DefaultSettings.php
===================================================================
--- mediawiki-1.23.13.orig/includes/DefaultSettings.php
+++ mediawiki-1.23.13/includes/DefaultSettings.php
@@ -429,7 +429,7 @@ $wgImgAuthUrlPathMap = array();
  *                      leave the paths in unchanged, or 'simple' to replace paths with
  *                      placeholders. Default for LocalRepo is 'simple'.
  *   - fileMode         This allows wikis to set the file mode when uploading/moving files. Default
- *                      is 0644.
+ *                      is 0640.
  *   - directory        The local filesystem directory where public files are stored. Not used for
  *                      some remote repos.
  *   - thumbDir         The base thumbnail directory. Defaults to "<directory>/thumb".
Index: mediawiki-1.23.13/includes/filerepo/FSRepo.php
===================================================================
--- mediawiki-1.23.13.orig/includes/filerepo/FSRepo.php
+++ mediawiki-1.23.13/includes/filerepo/FSRepo.php
@@ -50,7 +50,7 @@ class FSRepo extends FileRepo {
 				: "{$directory}/transcoded";
 			$fileMode = isset( $info['fileMode'] )
 				? $info['fileMode']
-				: 0644;
+				: 0640;
 
 			$repoName = $info['name'];
 			// Get the FS backend configuration
Index: mediawiki-1.23.13/includes/filebackend/FSFileBackend.php
===================================================================
--- mediawiki-1.23.13.orig/includes/filebackend/FSFileBackend.php
+++ mediawiki-1.23.13/includes/filebackend/FSFileBackend.php
@@ -82,7 +82,7 @@ class FSFileBackend extends FileBackendS
 			}
 		}
 
-		$this->fileMode = isset( $config['fileMode'] ) ? $config['fileMode'] : 0644;
+		$this->fileMode = isset( $config['fileMode'] ) ? $config['fileMode'] : 0640;
 		if ( isset( $config['fileOwner'] ) && function_exists( 'posix_getuid' ) ) {
 			$this->fileOwner = $config['fileOwner'];
 			$info = posix_getpwuid( posix_getuid() );
Index: mediawiki-1.23.13/includes/filebackend/FileBackendGroup.php
===================================================================
--- mediawiki-1.23.13.orig/includes/filebackend/FileBackendGroup.php
+++ mediawiki-1.23.13/includes/filebackend/FileBackendGroup.php
@@ -88,7 +88,7 @@ class FileBackendGroup {
 				: "{$directory}/transcoded";
 			$fileMode = isset( $info['fileMode'] )
 				? $info['fileMode']
-				: 0644;
+				: 0640;
 			// Get the FS backend configuration
 			$autoBackends[] = array(
 				'name' => $backendName,